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Questions tagged [aerial-photography]

Photographs taken from an airplane or another aircraft within the Earth's atmosphere.

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Problem with WMS/WMTS Layer Image Quality in QGIS

I have been using an aerial provided by the state. I add the layer as a WMS/WMTS. Typically the quality is on-par with the resolution depicted in the online hosted mapping program (GeoWeb). However, ...
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52 views

Extract water areas from aerial photogrammetry DEM in QGIS

We are working with peatland restoration sites providing aerial photogrammetry of the restoration progress. We want to differentiate between areas water and bare peat which can look very similar in ...
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40 views

Trigonometry and calculating the elevation angle from aerial photography

I was wondering whether anybody could advise me on a way to calculate the elevation angle from a camera to an object in an aerial photograph taken from a known elevation with no suitable reference ...
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1answer
45 views

Is it possible to load a WMS aerial photo from a external map into QGIS?

Is it possible to load a WMS based aerial photo (like https://geoinfo.frankfurt.de/luftbild-2018) into QGIS and use it as a background-layer for internal use?
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38 views

How to automatically compare two aerial photographs with a GIS with regard to certain features?

At present, we are trying to automatically record the new use of land by buildings by systematically comparing aerial photographs (e.g. 2007 farmland -> 2008 warehouse). For this purpose, high-...
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58 views

Splitting aerial photography into images with GPS coordinates

Splitting aerial photography into images with GPS coordinates Given this folder structure of (four) Oblique and (one) Vertical aerial photography of 10 cm resolution: dir/Orientations/footprints.cpg ...
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1answer
68 views

Where can I get aerial maps for offline use?

I'm looking for somewhere I can get aerial map files for exclusive offline use. Essentially I need aerial files (JP2K, GeoTIFF, etc.) that can be purchased or acquired and hosted on a private offline ...
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18 views

Where can I find decent resolution (5m ish) night time orthophotography/satellite imagery data for Ireland?

Anything I've found so far has been incredibly granular. I need a resolution which is fine enough to see general lighting footprints for motorway junctions.
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29 views

How much sidelap is adequate for aerial imagery?

How much sidelap is adequate for aerial imagery? My AOI has few buildings taller than 3 stories. I want to minimize building lean. I've seen imagery with 40% sidelap and the building lean is pretty ...
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25 views

Quantifying error on georeferenced aerial imagery

I georeferenced historical aerial imagery of a coastal area to estimate the size of oil sheens on the surface of the ocean. The control points I used were on land (street intersections, buildings, etc....
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3answers
45 views

What are the sources for old (1998 or earlier) satellite or aerial photos of the (southern) Netherlands?

Our municipality says that our garden is too big, according too the cadastre. If we can prove the situation has been already there for twenty years, then they won't charge us for the extra space our ...
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33 views

Comparing aerial photography with stream network (flow accumulation tool)?

I have obtained a stream network for my study area (in southern Uruguay, South America) from a DEM using the Hydrotools from ArcGIS. I want to determine a flow accumulation threshold comparing my ...
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42 views

Creating world files for a batch of aerial photos

I am looking for a way to geolocate a bunch of aerial photos by creating a world file per photo. The photos are taken in the same orientation and from the same altitude. The work flow would be to ...
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1answer
460 views

Photogrammetry route flown using Litchi misses photos at some waypoints

I have recently started using Litchi to fly waypoint-based photogrammetry flights with a DJI Phantom 4 Pro. The routes were created in DJI Flight Planner, then edited, uploaded, and executed in the ...
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2answers
76 views

Measuring acreage from satellite image?

I am trying to use a ESRI basemap satellite image in order to obtain forest acreage values from a tax map parcel (image included). I have a parcel that contains farmland and forested areas, and I want ...
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1answer
78 views

Aerial Triangulation by using GPS height

Is it possible to use GPS geographic coordinates & ellipsoidal height not orthometric heights in Aerial Triangulation?
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1answer
60 views

Opening Cities Revealed data from 1990s?

I have been given a lot of aerial imagery from the mid-1990s that is in '.crv' format. The software/company at the time was called 'Cities Revealed'. Does anybody know how I'd go about opening it? ...
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51 views

How to correct bad georeference data in a raster? [duplicate]

I'm doing a bit of vegetation mapping and I'm relatively new to GIS. My issue is that the aerial photographs I have are georeferenced with world files (.jpgw) but they are ever-so-slightly off. The ...
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1answer
43 views

Tiling geocoded aerials in QGIS

I am new to QGIS 2.18 and have 2 geocoded aerials from the Las Vegas valley from different years. The newer aerial has a area missing from the northwest part of town. The older aerial has the missing ...
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2answers
978 views

Converting 4-band TIF to PNG while keeping all 4 bands?

I have a number of aerial photos containing both RGB and a near-infrared band. The images are in TIF-format, however I need to convert them to PNG without losing any of the bands. I have tried ...
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1answer
320 views

Which type of point cloud is more accurate: from airborne LiDAR or aerial photos?

I have been offered two types of point cloud for my 3D Project. The data will be used by the environmental agency in various projects e.g. flood-risk analysis, dyke conservation, and nature ...
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1answer
119 views

Processing historic aerial imagery mosaics

I'd like to process multiple sets of old (>1938) aerial imagery that are scanned, but whether merged nor georeferenced. While I had good results with QGIS to align single photos, using passpoints, ...
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28 views

Camera reports database online to look it up?

I received tons of aerial photos that go back to 1930's and I have the information about the camera number and lens number and focal length. They were taken in a picture of the roll that tells us what ...
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1k views

export an aerial image to .SID file and a .Tiff file

I am using arcmap 10.4.1 ( also have PRO 2.0 is this is an valid option) I have an aerial image that was broken down to small grids and need to export each grid to a .sid file and a .tiff file. I ...
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1k views

Finding source of Google Earth imagery

Zooming around Northern California on Google Earth reveals that Google have extremely high resolution imagery for not just cities but also rural and wilderness areas. I would guess it's something ...
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2answers
215 views

Performing aerial triangulation on scanned aerial photos without having surveyed ground control points (GCPs)?

I have a set of 1200 historical aerial photos covering North Carolina outer banks area from 1974, 1984 and 1992. I need to georeference them and produce seamless color balanced dataset that will be ...
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3answers
67 views

How many forest clear cuts and how big are they?

I have forest stand characteristic data from northern Sweden. We have interpreted multiple years of aerial photos and now have polygons outlining different forest stand ages over time (e.g. clear cuts,...
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1answer
77 views

Distortion at the edges of the planetscope images

Good morning, does anyone know of a document that explains the distortion on the edges of some planetscope images? Do you know why this happens?
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1answer
84 views

Creating a raster mosaic from multiple un-referenced jpegs

I have multiple historical aerial photographs that I would like to use to compare coastal change over time in relation to urban development. The aerials I have obtained come in tiles that are not ...
2
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1answer
1k views

Merging a vector layer with a Raster layer

I have a Tiff file that has an aerial view and also a shapefile which has contours of the same area. How can I put the contours in the tiff file so that you can view the TIFF and see them both in one ...
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49 views

Drawing of building outlines (rooftops) based on low resolution aerial images

Google maps provides street and rooftop maps from corresponding aerial imagery, but not for all places. Please is there a method or available software to help outline rooftops from a set of map-tiles,...
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0answers
60 views

Make images/PDFs in QGIS from Vector Layers [closed]

I have a bunch of vector layers and a few polygons that I want to use to create a image out of while having my image in the background of an aerial photo. I am unsure what commands to use to ...
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2answers
48 views

Where water will be on a mudflat as tide comes in/goes out?

My study area is large intertidal mudflat in NE England. I want know where the water will be depending on tide height. The attached shows an aerial of my study area. I've photoshopped in the blue ...
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2answers
847 views

Using Custom Aerial Raster Imagery with OpenLayers 3 or 4

Currently, openlayers supports bing maps, however this is not an ideal option for a commercial application. What would be ideal is to have the ability to host and serve ariel imagery like NASA blue ...
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1answer
532 views

Can USGS High Resolution Orthoimagery be viewed online?

I found the USGS EarthExplorer where one can download their High Resolution Orthoimagery. This imagery can also be previewed in the EarthExplorer once a particular tile is found, but I wonder if there ...
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1answer
2k views

GIS or Remote Sensing in the movies?

Looking for examples where GIS or RS has been a part of a movie plot. I'm trying to put together a "GIS & RS and the Cinema" class, in which examples of GIS & RS are shown. Those examples will ...
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3answers
140 views

Interactively deleting tiles of aerial photographs using ArcGIS Desktop?

I have a bunch of separated aerial photographs (res. 20 cm, count ~ 50, total size 20GB) stored in single folder. I do not have a reference polygon layer noting the extent and name of each title ...
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0answers
80 views

How to align 3D contour file, aerial imagery and design drawings from engineers in microstation v8i series 3.

I am looking to align a 3D contour dgn file with the design drawings from an engineer in microstation. Then align an orthorectified aerial image (Scale 1:10 000) to the contour file and design ...
3
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1answer
109 views

Interpretation of historical aerial imagery

I've been having to look at historical aerial imagery with my job as of late. The goal is to identify and describe historic land use of the sites. Specifically, I've come across sites that were ...
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2answers
14k views

Difference between irradiance and radiance, remote sensing reflectance and water leaving radiance

I've been trying to lay my hands on textbooks, etc, that explain the differences between the remote sensing terms in lay man language. radiance and irradiance remote sensing reflectance and water ...
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2answers
94 views

Knowing the pixel size for a raster before it was resampled

Is there a method to know the exact pixel size (the original size) of a raster “aerial photo”? I have purchased an Arial photo with 10 cm pixel size resolution, and I received a sample of it, but ...
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1answer
899 views

How large area can be scanned from one drone (UAV)? [closed]

How large area can be scanned from one drone if the drone doesn't move? In other words how much aerial photography data can be obtained from one drone with fixed position? I'm talking about classical ...
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1answer
117 views

How to perform segmentation in GRASS?

I have an aerial photo which consists of 2 files (.jp2, j2w) and i want to perform a segmentation. To be exact, i can't upload the 2 files with r.in.gdal because it says that the data file cannot be ...
2
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1answer
84 views

aerial vintage changes in one compiled raster, how to split it?

What is the best way to create polygons defining borders where aerial vintages change? This is one big merge of aerial data here that needs to be split into 3 tiffs based on the vintages. Doing it ...
3
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1answer
138 views

Extracting raster classe(s) and creating new raster that is SMALLER in size using QGIS?

Extracting raster values and creating new raster in QGIS? works great but there is no reduction in the new raster file size after raster calculator is run displaying just one or two classes (values) ...
2
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1answer
199 views

Georeferencing batch geotagged photos

I am struggling with georeferencing over 300 aerial photographs. All of those photographs are geotagged and generally are rather easy to georeference but I am wandering if that can be done ...
3
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1answer
779 views

Drone that generates a point cloud from photography

I read this in a trade magazine today, ​“Esri has just released the Drone2Map for ArcGIS app, which transforms high-resolution drone imagery into ready-to-use aerial data in the GIS platform. ...
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3answers
108 views

Apply accuracy measures from partial area to the whole classified maps?

I applied supervised maximum likelihood classification to a yearly stack of Landsat images (resolution 30m). The land cover classes are related to coniferous forest, i.e., forest, clear-cut, fire, ...
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1answer
266 views

Accuracy Assessment for single date classification - possible to apply to classification without reference images?

I applied supervised maximum likelihood classification to a yearly stack of Landsat images (resolution 30m). The land cover classes are related to coniferous forest, i.e., forest, clear-cut, fire, ...
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1answer
2k views

Hec-Ras 5.0: Adding aerial imagery to geometric view

I'm having trouble displaying an aerial imager in the HEC-RAS geometric view in version 5.0.1. I've added the aerial, a project TIF file, to the RAS Mapper and it shows up without issue. When I go to ...