Uses of aerial photography pdf
MILITARY USES OF AERIAL PHOTOGRAPHS* Captain R. R. Arnold, C.B. T HE army uses aerial photographs for two general purposes. One of these purposes is the preparation of the maps which are used by army staffs to
436 2. USE OF AIRBORNE LiDAR IN FORESTRY 2.1 LiDAR Characteristics LiDAR (Light Detection and Ranging) is an active sensor that emits laser pulses and measures the return
Remote Sensing and Image Processing Aerial Photography and Photogrammetry Structure • Definitions of Remote Sensing • Origins of remote sensing • Types of aerial photograph • Photogrammetry • Parallax • Human vision • Conclusions Definitions of Remote Sensing Can be very general, e.g. “The acquisition of physical data of an object without touch or contact” (Lintz and …
This paper uses this example to demonstrate the usefulness of aerial photography in site investigation and in particular the value of oblique photography, a topic which receives little attention in BS 5930:1981 considering how cost effective this tool can be.
Remote Sensing and Aerial Photography Print While field studies are essential for understanding the geomorphic environment or setting of a region, remote sensing imagery—specifically easily obtained aerial photographs and satellite imagery—provides a broad overhead view, a context in which to place field observations.
The new, completely updated edition of the aerial photography classic. Extensively revised to address today’s technological advances, Aerial Photography and Image Interpretation, Third Edition offers a thorough survey of the technology, techniques, processes, and methods used to create and interpret aerial photographs.
aerial photographs An aerial photograph is any photograph taken from an airborne vehicle (aircraft, drones, balloons, satellites, and so forth). The aerial photograph has many uses in military operations; however, for the purpose of this manual, it will be considered primarily as a …
USE OF AERIAL PHOTOGRAPHY FOR INDIANA LAND STUDIES 727 FIG. 2. The patterns of featureless white fields, and others with straight parallel stripes are
Principles of Aerial Photography Basic Concepts. Film: air photo missions are flown using black and white film, color, infrared, and false-color infrared film are sometimes used for special projects.
Aerial Photographs: General Information. What is aerial photography? Aerial photography is the acquisition of a vertical image with a specialize camera installed on board of an airplane, equipped for this type of work.
discussion by considering how aerial photographs are used in the interpretation of cultural features. In Canada most aerial photography is obtained by air-survey companies under contract to various Federal or Provincial government agencies.
length of four feet and a width (4 ft) of four inches (4 in) for aerial photography scales 1:3600 (1”=300’) or larger. hite paint on new asphalt Using w black paint on new concrete make and excellent targets.
Ecological monitoring and management require detailed information over broad spatial scales. Historically, such information was often acquired through manual interpretation of aerial photographs.
AeriAl PhotogrAPhy 101 rotordronemag.com
of Sustainability and Forests and Reserves
– Coordinated Imagery Program
LESSON 13 AERIAL PHOTOGRAPHS Key Concepts X-planation
Aerial photography Food and Agriculture Organization
Oblique photographs Photographs and drawings Geography
Integration of GPS Digital Imagery and GIS with Census
The Roles of Aerial Photographs in Forestry Remote Sensing
Aerial Imagery GIS Data Presentation Presentation Goals: • Introduction • Discussion about current imagery uses and needs • Overview of Imagery (satellite, aerial photography-
DRONE ON! Emerging Legal Issues for Commercial Use of . Unmanned Aerial Vehicles (UAVs): Will You and Your Clients Be . Ready for the Invasion of American Airspace?
Digital Cameras in Unmanned Aerial Vehicles (UAV) for Military and Commercial Uses Lg11059 offers complete imaging solution for the growing UAV market Architecture The imaging subsystem of a UAV relies on a variety of enabling technologies including sensors, computing devices and wireless communications. A typical platform would comprise of multiple digital cameras that interface to a
discussion by considering how aerial photographs are used in the interpretation of cultural features. In Canada most aerial photography is obtained by air-survey companies under contract to various Federal or Provincial government agencies.
Aerial Photographs: General Information. What is aerial photography? Aerial photography is the acquisition of a vertical image with a specialize camera installed on board of an airplane, equipped for this type of work.
Other important concepts used in aerial photography are stereoscopic coverage, fiducial marks, focal length, roll and frame numbers, and flight lines and index maps. The following material will help you understand the fundamentals of aerial photography by explaining these basic technical concepts.
5.2 uses of aerial photographs Aerial photographs can be utilized in both planimetric and topographic mapping as well as in photo interpretation or image analysis for various disciplines.
Ecological monitoring and management require detailed information over broad spatial scales. Historically, such information was often acquired through manual interpretation of aerial photographs.
Aerial Photography. Aerial photography remains an important application of remote sensing, with a sophisticated range of cameras being used to collect information on geology, land use, agricultural management, forestry, water pollution, natural disasters, urban planning, wildlife management, and environmental impact assessments.
The use of SPOT and CIR aerial photography for urban planning P. Lohmann, G. Altrogge 1. Abstract Institute for Photogrammetry and Engineering Surveys University of Hannover, Nienburger Strasse 1 o 3000 Hannover, Fed. Rep. of Germany
Chapter 10 Principles of Photogrammetry 10-1. General The purpose of this chapter is to review the principles of photogrammetry. The chapter contains background information and references that support the standards and guidelines found in the previous chapters. Section I reviews the basic elements of photogrammetry with an emphasis on obtaining quantitative information from aerial photographs
Historical Aerial Photography Boundaries (LGATE-202) Landgate has historical aerial imagery covering a large portion of Western Australia. Aerial imagery has been captured from 1948 to the present day.
Use of Unmanned Aerial Vehicles in Crime Scene
Use of Aerial Photography for Indiana Land Studies
Aerial photography (or airborne imagery) is the taking of photographs from an aircraft or other flying object. Platforms for aerial photography include fixed-wing aircraft, helicopters, unmanned aerial vehicles (UAVs or “drones”), balloons, blimps and dirigibles, rockets, pigeons, kites, parachutes, stand-alone telescoping and vehicle-mounted
Applications for Aerial Photography This page provides an overview of different applications in which Aerial Photos are used and shows APDER´s role in each area. APDER was founded with the idea of using Aerial Images for civil protection and humanitarian purposes.
length of four feet and a width (4 ft) of four inches (4 in) for aerial photography scales 1:3600 (1”=300’) or larger. hite paint on new asphalt Using w black paint on new concrete make and excellent targets.
Until recently, aerial photography did play a major role in geographic data acquisition in urban areas, and the use of satellite imagery, due to its low resolution, was limited to the study of some phenomena like floods and urban pollution.
Remote Sensing and Aerial Photography Earth 530 The
Can I use a fpv drone for aerial photography? (new) drones
The information will be used to process an order for aerial photography. The information collected on this form may be disclosed to other Federal, State, Local government agencies, Tribal agencies, and nongovernmental entities that have been authorized access to the information by statute or regulation and/or as described in applicable Routine Uses identified in the System of Records Notice
Coordinated Imagery Program (CIP) 2 • CIP Objectives: • To Coordinate the Acquisition of aerial imagery and elevation across Victoria. • To Reduce Cost by encouraging Victorian Government and non government agencies to work together and share the cost of acquisition. • To Improve Quality through setting of standards and quality assurance measures which allows the imagery to be used for
THE USE OF SATELLITE AND AERIAL IMAGERY, AND GPS FOR DELINEATION OF EA BOUNDARIES Roberto Bianchini. 2010 WORLD POPULATION AND HOUSING CENSUS PROGRAMME Regional Workshop on International Standards, Contemporary Technologies for Census Mapping and Data Processing, Minsk, Belarus, 8-12 December 2008 Interuniversity Research Center …
Aerial photo projects for all mapping and most image analyses require that a series of exposures be made along each of the multiple flight lines. To guarantee stereoscopic coverage throughout the site, the photographs must overlap in two directions: in the line of flight and between adjacent flights. 6.3.1 Endlap Endlap, also known as forward overlap, is the common image area on consecutive
Microsoft PowerPoint Session 8 satellite aerial and GPS
aerial photograph an overview ScienceDirect Topics
discussion by considering how aerial photographs are used in the interpretation of cultural features. In Canada most aerial photography is obtained by air-survey companies under contract to various Federal or Provincial government agencies.
Introduction Photogrammetry is a surveying and mapping technique which can be used in various applications. There are many uses of Photogrammetry in the surveying industry such as topographic mapping, site planning, earthwork volumes,
Digital Cameras in Unmanned Aerial Vehicles (UAV) for Military and Commercial Uses Lg11059 offers complete imaging solution for the growing UAV market Architecture The imaging subsystem of a UAV relies on a variety of enabling technologies including sensors, computing devices and wireless communications. A typical platform would comprise of multiple digital cameras that interface to a
Coordinated Imagery Program (CIP) 2 • CIP Objectives: • To Coordinate the Acquisition of aerial imagery and elevation across Victoria. • To Reduce Cost by encouraging Victorian Government and non government agencies to work together and share the cost of acquisition. • To Improve Quality through setting of standards and quality assurance measures which allows the imagery to be used for
Ecological monitoring and management require detailed information over broad spatial scales. Historically, such information was often acquired through manual interpretation of aerial photographs.
Aerial photography Wikipedia
Aerial photography for the assessment of crop condition a
CAE 2008 CAE Handbook Paper 3, Test 2 Part 1 For questions 1 – 12, read the text below and decide. which answer (A, B, C or D) best fits each gap.
Aerial Imagery GIS Data Presentation Presentation Goals: • Introduction • Discussion about current imagery uses and needs • Overview of Imagery (satellite, aerial photography-
BY STEPHEN H. SPURR This article describes and evaluates the use of aerial photographs in the field of forestry, particularly in making vegetation and land-use surveys and in making forest inventories.
Principles of Aerial Photography Basic Concepts. Film: air photo missions are flown using black and white film, color, infrared, and false-color infrared film are sometimes used for special projects.
Applications for Aerial Photography This page provides an overview of different applications in which Aerial Photos are used and shows APDER´s role in each area. APDER was founded with the idea of using Aerial Images for civil protection and humanitarian purposes.
Until recently, aerial photography did play a major role in geographic data acquisition in urban areas, and the use of satellite imagery, due to its low resolution, was limited to the study of some phenomena like floods and urban pollution.
Remote Sensing and Aerial Photography Print While field studies are essential for understanding the geomorphic environment or setting of a region, remote sensing imagery—specifically easily obtained aerial photographs and satellite imagery—provides a broad overhead view, a context in which to place field observations.
Introduction To Aerial Photographs National Council Of
(PDF) Aerial Photography A Rapidly Evolving Tool for
Digital Cameras in Unmanned Aerial Vehicles (UAV) for Military and Commercial Uses Lg11059 offers complete imaging solution for the growing UAV market Architecture The imaging subsystem of a UAV relies on a variety of enabling technologies including sensors, computing devices and wireless communications. A typical platform would comprise of multiple digital cameras that interface to a
DRONE ON! Emerging Legal Issues for Commercial Use of . Unmanned Aerial Vehicles (UAVs): Will You and Your Clients Be . Ready for the Invasion of American Airspace?
Principle of aerial photography and photogrammetry, types of aerial photographs, scale of aerial photograph. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
The uses of oblique photographs are endless. Cartographers use them to construct physical and topographical maps. The property and construction industries also use oblique photographs to record and measure properties, as well as to track the progress of development sites.
Aerial Photographs: General Information. What is aerial photography? Aerial photography is the acquisition of a vertical image with a specialize camera installed on board of an airplane, equipped for this type of work.
Aerial photographs are another type of photograph used by geographers. This chapter explains what an aerial photograph is and how it differs from other types of photographs. It discusses the advantages and disadvantages of aerial photographs and outlines how to record and interpret them.
Aerial photo projects for all mapping and most image analyses require that a series of exposures be made along each of the multiple flight lines. To guarantee stereoscopic coverage throughout the site, the photographs must overlap in two directions: in the line of flight and between adjacent flights. 6.3.1 Endlap Endlap, also known as forward overlap, is the common image area on consecutive
The use of SPOT and CIR aerial photography for urban planning P. Lohmann, G. Altrogge 1. Abstract Institute for Photogrammetry and Engineering Surveys University of Hannover, Nienburger Strasse 1 o 3000 Hannover, Fed. Rep. of Germany
discussion by considering how aerial photographs are used in the interpretation of cultural features. In Canada most aerial photography is obtained by air-survey companies under contract to various Federal or Provincial government agencies.
Eisenbeiss 135 The Potential of Unmanned Aerial Vehicles for Mapping HENRI EISENBEISS, Zurich ABSTRACT Unmanned aerial vehicles (UAVs) can be used for mapping in the close range domain, combining aerial and terrestrial
They are routinely used when interpreting aerial photos and analyzing photo-like images. An experienced image interpreter uses many of these elements intuitively. However, a beginner may not only have to consciously evaluate an unknown object according to these elements, but also analyze each element’s significance in relation to the image’s other objects and phenomena.
The information will be used to process an order for aerial photography. The information collected on this form may be disclosed to other Federal, State, Local government agencies, Tribal agencies, and nongovernmental entities that have been authorized access to the information by statute or regulation and/or as described in applicable Routine Uses identified in the System of Records Notice
Aerial photography is the taking of photographs from an aircraft or other flying object. Platforms for aerial photography include fixed-wing aircraft, helicopters, unmanned aerial vehicles (UAVs or “drones”), balloons, blimps and dirigibles, rockets, pigeons, kites, parachutes, stand-alone telescoping and vehicle-mounted poles.
348 Aerial photography of crops Table 1. The four major types of film used for aerial photography Film emulsion Sensitivity of film emulsion
CAE 2008 CAE Handbook Paper 3, Test 2 Part 1 For questions 1 – 12, read the text below and decide. which answer (A, B, C or D) best fits each gap.
Military Uses Of Aerial Photographs ASPRS
Microsoft PowerPoint Session 8 satellite aerial and GPS
The use of aerial photography to assess and map landscape change is a crucial element of ecosystem management. Aerial photographs are ideal for mapping small ecosystems and fine-scale landscape features,
MILITARY USES OF AERIAL PHOTOGRAPHS* Captain R. R. Arnold, C.B. T HE army uses aerial photographs for two general purposes. One of these purposes is the preparation of the maps which are used by army staffs to
The new, completely updated edition of the aerial photography classic. Extensively revised to address today’s technological advances, Aerial Photography and Image Interpretation, Third Edition offers a thorough survey of the technology, techniques, processes, and methods used to create and interpret aerial photographs.
BY STEPHEN H. SPURR This article describes and evaluates the use of aerial photographs in the field of forestry, particularly in making vegetation and land-use surveys and in making forest inventories.
As aerial photographs are widely used in geography education, it is important to know how children’s understanding of these representations develops through the school years.
Ecological monitoring and management require detailed information over broad spatial scales. Historically, such information was often acquired through manual interpretation of aerial photographs.
Principles of Aerial Photography Basic Concepts. Film: air photo missions are flown using black and white film, color, infrared, and false-color infrared film are sometimes used for special projects.
aerial systems and aerospace engineering 201 aerial photography and the use of photo cameras attached to drones mihai radulescu, victor vladareanu
Applications for Aerial Photography This page provides an overview of different applications in which Aerial Photos are used and shows APDER´s role in each area. APDER was founded with the idea of using Aerial Images for civil protection and humanitarian purposes.
(PDF) Aerial Photography Share and discover research
Environmental application of aerial reconnaissance to
Applications for Aerial Photography This page provides an overview of different applications in which Aerial Photos are used and shows APDER´s role in each area. APDER was founded with the idea of using Aerial Images for civil protection and humanitarian purposes.
The use of SPOT and CIR aerial photography for urban planning P. Lohmann, G. Altrogge 1. Abstract Institute for Photogrammetry and Engineering Surveys University of Hannover, Nienburger Strasse 1 o 3000 Hannover, Fed. Rep. of Germany
30/03/1985 · High altitude digital aerial photography is a specialized technology that uses cameras to collect visible and near-infrared reflected energy over a broad area, given the …
With aerial photogrammetry, you combine aerial photography shots to create 2D or 3D models. Specifically, cartographers will combine the aerial shots, as long as the shots feature at least two difference angles of the same general area. This guideline will go over the uses of aerial photogrammetry and how the photographs for photogrammetry are obtained.
BASICS OF AERIAL PHOTOGRAPHY GEOMETRY Produced By: Sean Pickner Major Aspects to Consider ¤ Vertical, Tilted, and Oblique Angles ¤ Nadir ¤ Isocenter ¤ Principal Point ¤ Focal Length ¤ Photo Scale ¤ Field of View. 10/6/2009 2 Vertical, Tilted and Oblique Photographs Vertical or Tilted Angle Photographs Ø Tilted photographs have 3% or less tilt Ø True Vertical photograph Ø …
History of Aerial Photography and Survey The first aerial photograph was oblique and taken of a French village in the late 19th century. but you will lack the perspective.patented the concept of using aerial photographs to compile maps (5). employing teams of archaeologists to interpret masses and masses of photographs taken for aerial reconnaissance purposes (11. After the war.
Aerial photo projects for all mapping and most image analyses require that a series of exposures be made along each of the multiple flight lines. To guarantee stereoscopic coverage throughout the site, the photographs must overlap in two directions: in the line of flight and between adjacent flights. 6.3.1 Endlap Endlap, also known as forward overlap, is the common image area on consecutive
Types of Aerial Photographs & Reading Topographic Maps
The use of SPOT and CIR aerial photography for urban
The use of SPOT and CIR aerial photography for urban planning P. Lohmann, G. Altrogge 1. Abstract Institute for Photogrammetry and Engineering Surveys University of Hannover, Nienburger Strasse 1 o 3000 Hannover, Fed. Rep. of Germany
USE OF AERIAL PHOTOGRAPHY FOR INDIANA LAND STUDIES 727 FIG. 2. The patterns of featureless white fields, and others with straight parallel stripes are
nasa contractor report nasa cr-62099 (nasa-cr-62099) the use of color n74-31855 infrared aerial photography in determining salt marsh vegetation and delimiting
Natural color aerial photography and lidar data were collected for Richland County from 01 to 22 March, 2000 at a nominal height of 1,200 m (3,900 ft) above ground level ( AGL ).
Chapter 4 Properties of Aerial Photography 4.1 Introduction Aerial photography is the basic data source for making maps by photogrametric means. The photograph is the end result of the data acquisition process discussed in the previ-
Other important concepts used in aerial photography are stereoscopic coverage, fiducial marks, focal length, roll and frame numbers, and flight lines and index maps. The following material will help you understand the fundamentals of aerial photography by explaining these basic technical concepts.
MILITARY USES OF AERIAL PHOTOGRAPHS* Captain R. R. Arnold, C.B. T HE army uses aerial photographs for two general purposes. One of these purposes is the preparation of the maps which are used by army staffs to
Aerial photographs are another type of photograph used by geographers. This chapter explains what an aerial photograph is and how it differs from other types of photographs. It discusses the advantages and disadvantages of aerial photographs and outlines how to record and interpret them.
AERIAL PHOTOGRAPHY AND THE USE OF PHOTO CAMERAS
PPT – Aerial Photography PowerPoint presentation free to
Ecological monitoring and management require detailed information over broad spatial scales. Historically, such information was often acquired through manual interpretation of aerial photographs.
Aerial Photographs Map Reading
This paper uses this example to demonstrate the usefulness of aerial photography in site investigation and in particular the value of oblique photography, a topic which receives little attention in BS 5930:1981 considering how cost effective this tool can be.
of Sustainability and Forests and Reserves
Children’s Understanding of Aerial Photographs Children’s
Principle of aerial photography and types.ppt SlideShare
The rationale for our choice of aerial reconnaissance, other uses of low-level aerial surveillance, the utility of small-format camera aerial photography for environmental analysis, and methods used for locating open dumps are discussed.
of Sustainability and Forests and Reserves
aerial photograph an overview ScienceDirect Topics
The Use of Aerial Photography – Aerial photography is an important part of aerial surveillance and has various applications. PowerPoint PPT presentation free to view Aerial drone photographer Sydney – Real estate photographers specialize in capturing and editing photographs that provide warm lighting and ascetically pleasing angles, resulting in increased click through rates and home interest.
Types of Aerial Photographs & Reading Topographic Maps
aerial photographs An aerial photograph is any photograph taken from an airborne vehicle (aircraft, drones, balloons, satellites, and so forth). The aerial photograph has many uses in military operations; however, for the purpose of this manual, it will be considered primarily as a …
What Is Aerial Photogrammetry? Steve’s Digicams
Aerial Photographs and Satellite Images USGS
Aerial Imagery GIS Data Presentation Presentation Goals: • Introduction • Discussion about current imagery uses and needs • Overview of Imagery (satellite, aerial photography-
Properties of Aerial Photography The University of Arizona
The Use of Aerial PhotographyauthorSTREAM
THE USE OF SATELLITE AND AERIAL IMAGERY, AND GPS FOR DELINEATION OF EA BOUNDARIES Roberto Bianchini. 2010 WORLD POPULATION AND HOUSING CENSUS PROGRAMME Regional Workshop on International Standards, Contemporary Technologies for Census Mapping and Data Processing, Minsk, Belarus, 8-12 December 2008 Interuniversity Research Center …
Introduction Durban
Aerial photography Principles About Us
If you are interested in aerial photography, you will probably be disappointed in a typical freestyle or racing FPV drone. They are great for creating action packed video, but not that great for photos in my experience. You might be able to build one that would work for you, but a purpose built photography drone would probably be better.
The Potential of Unmanned Aerial Vehicles for Mapping
AERIAL PHOTOGRAPHY AND THE USE OF PHOTO CAMERAS
The Roles of Aerial Photographs in Forestry Remote Sensing
Aerial photography (or airborne imagery) is the taking of photographs from an aircraft or other flying object. Platforms for aerial photography include fixed-wing aircraft, helicopters, unmanned aerial vehicles (UAVs or “drones”), balloons, blimps and dirigibles, rockets, pigeons, kites, parachutes, stand-alone telescoping and vehicle-mounted
AeriAl PhotogrAPhy 101 rotordronemag.com
THE USE OF COLOR INFRARED AERIAL PHOTOGRAPHY IN
This paper uses this example to demonstrate the usefulness of aerial photography in site investigation and in particular the value of oblique photography, a topic which receives little attention in BS 5930:1981 considering how cost effective this tool can be.
Introduction Durban
Use of Unmanned Aerial Vehicles in Crime Scene
Principles of Aerial Photography Rocky Mountain Aerial
Natural color aerial photography and lidar data were collected for Richland County from 01 to 22 March, 2000 at a nominal height of 1,200 m (3,900 ft) above ground level ( AGL ).
DRONE ON! Emerging Legal Issues for Commercial Use of
REQUEST FOR CUSTOM AERIAL PRINT fsa.usda.gov
Aerial photographic and satellite image interpretation
436 2. USE OF AIRBORNE LiDAR IN FORESTRY 2.1 LiDAR Characteristics LiDAR (Light Detection and Ranging) is an active sensor that emits laser pulses and measures the return
REQUEST FOR CUSTOM AERIAL PRINT fsa.usda.gov
DRONE ON! Emerging Legal Issues for Commercial Use of . Unmanned Aerial Vehicles (UAVs): Will You and Your Clients Be . Ready for the Invasion of American Airspace?
LESSON 13 AERIAL PHOTOGRAPHS Key Concepts X-planation
Aerial photography Wikipedia
The Use of Aerial Photography – Aerial photography is an important part of aerial surveillance and has various applications. PowerPoint PPT presentation free to view Aerial drone photographer Sydney – Real estate photographers specialize in capturing and editing photographs that provide warm lighting and ascetically pleasing angles, resulting in increased click through rates and home interest.
Use of Unmanned Aerial Vehicles in Crime Scene
Microsoft PowerPoint Session 8 satellite aerial and GPS
The Roles of Aerial Photographs in Forestry Remote Sensing
LESSON 13: AERIAL PHOTOGRAPHS Key Concepts In this lesson we will focus on summarising what you need to know about: Oblique and vertical aerial photographs – identifying landforms and features Use of tone, texture and shadow in interpretation Orthophoto maps – identifying features Orientating aerial photographs and orthophoto maps to topographic maps X-planation Introduction …
Aerial photography Wikipedia
Chapter 10 Principles of Photogrammetry The geometry of a
Properties of Aerial Photography The University of Arizona
Aerial photography is an important part of aerial surveillance and has various applications.- authorSTREAM Presentation. Aerial photography is an important part of aerial surveillance and has various applications.- authorSTREAM Presentation
Geometry of Aerial Photographs* GIS-Lab
Introduction To Aerial Photographs National Council Of
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Aerial Photography. Aerial photography remains an important application of remote sensing, with a sophisticated range of cameras being used to collect information on geology, land use, agricultural management, forestry, water pollution, natural disasters, urban planning, wildlife management, and environmental impact assessments.
Aerial Photographs and Satellite Images USGS