13 votes
Accepted

Examples of GIS or Remote Sensing in movies

This question has been converted to Community Wiki and wiki locked because it is an example of a question that seeks a list of answers and appears to be popular enough to protect it from closure. ...
10 votes

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

I've found two sources that appear to provide easy to read explanation between Radiance vs. Irradiance and remote sensing reflectance and water leaving radiance. Starting with Radiance vs. Irradiance: ...
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  • 11.8k
8 votes
Accepted

What format and settings to use for aerials photos in QGIS?

Based on huckfinn answers, few other comments and together with my findings: Winning format is JPEG2000 (why and which version is mentioned below Why not others) Why not others: JPEG Size ...
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  • 9,216
8 votes
Accepted

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

This is a limitation of the PNG format. It only has 3 information channels (RGB), so one of your bands will be suppressed. If you really need to, you can save your NIR band as an alpha channel, but ...
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7 votes

merging raster aerials in QGIS issue

I doubt your process "gets caught in a loop", I think it will just take a long time to complete as your rasters are actually quite large. Those "small rasters totally less than 100mb" are roughly ...
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  • 51.8k
7 votes
Accepted

What lens and camera settings are recomended for UAV (drone) aerial imagery capture?

All of the specific answers I can come up with would have likely already occurred to you as a photographer. A low distortion lens with a shorter focal length (based on your prospective altitude). High ...
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  • 15.5k
6 votes

Seeking Software for Stitching Aerial Photographs?

This question has been converted to Community Wiki and wiki locked because it is an example of a question that seeks a list of answers and appears to be popular enough to protect it from closure. ...
5 votes

What resampling technique should be used when projecting aerial photos?

I know that this question is rather old, but I wanted to add my 2 cents, in case others come across this thread trying to answer the same question... The previous answers are correct when you truly ...
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5 votes
Accepted

Using Phantom 3 Pro to capture aerial imagery for small site plans and derive DEM?

I can confidently say yes. Add in some surveyed ground control points and you can easily get 10 cm positional accuracy. So far there are two big players that I have been using pix4d is by far the ...
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  • 1,054
5 votes

Are there any open source tools for the processing of UAV images?

I have been using three different programs for that: AirPhotoSE, VSfm and OpenDroneMap. All of them are easy to work, specially if default values give good results for your pictures. AirPhotoSE is ...
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  • 428
5 votes

How many forest clear cuts and how big are they?

Assuming you have attributes for the polygons for each type (clear cuts, young forest, etc), you can run the Dissolve tool in ArcGIS with this ‘Type’ column as the Dissolve_Field. This will aggregate ...
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  • 566
5 votes

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

I will just answer my own question here, if anyone runs into the same problem with multiband images and TensorFlow. I ended up using Keras on top of TensorFlow and instead of feeding the image files ...
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  • 400
4 votes

Is there an efficient way of sending a large raster image?

It's been most of a decade since storing rasters inside an ArcSDE-enabled database was best practice, but if your geodatabase is old enough (though not too old), there may be a simple solution: The ...
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  • 18.8k
4 votes

Changing QGIS map from ' bird's eye / aerial view' to normal view?

What you experience is not an aerial view, but rather a project CRS set to decimal degrees, like EPSG:4326. With that, longitudes and latitudes have different scales, if your working area is far from ...
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  • 74.9k
4 votes

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

If your area of overlap is large enough and the land cover in the scene is homogeneous, you can make the hypothesis that your area is representative. Under that hypothesis, you can use a stratified ...
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  • 48.5k
4 votes

Can USGS High Resolution Orthoimagery be viewed online?

You can use Zoom Earth which allows you to control dates and times. You could also access Remote Pixels Satellite Search. Finally, You can get to the raw data on Amazon Web Services (Landsat Only)
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  • 1,821
4 votes

Using Custom Aerial Raster Imagery with OpenLayers 3 or 4

You could use this example as a template. You can substitute in any tile server in the form http:{a}.server/layer/{z}/{x}/{y}.png, where server is the url, layer is the layer name, and z, x, y and the ...
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  • 13.2k
4 votes

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

In my work I encounter this situation often. The method that I use is next: Prepare the images in Photoshop: crop, contrast, brightness, whatever is needed to improved image quality. Also in ...
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  • 557
3 votes

Cropping aerial image using Python?

You should try using the GDAL library (Python) to clip your raster. GDAL_translate should work for your needs. Link below to a similar question. [Clipping raster with vector layer using GDAL
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  • 2,890
3 votes

Aerial Photograph Footprint Size Calculation

We have created an webpage with a script that will perform the calculation for you: Aerial Camera Ground Footprint Calculator. You just have to enter the variables mentioned and click the Calculate ...
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3 votes

Options for Aerials QGIS 2.10

You can add Google Aerial basemap to you QGIS canvas using Google TMS. Save the following as .xml file and load it as a raster in QGIS <GDAL_WMS> <!-- Data is subject to term of use ...
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  • 8,197
3 votes

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

If you want to assess the accuracy of a supervised classification, you compare your classification results to your ground truth. Thus, results and ground truth can only be compared within an area in ...
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  • 285
3 votes
Accepted

Drone that generates a point cloud from photography

Probably they have made a structure from motion function. With the mosaic of several pictures around an object you can create its 3d model and get also the point cloud. Thats nothing too spectacular. ...
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  • 6,025
3 votes

Knowing the pixel size for a raster before it was resampled

Upsample the image to the suspected resolution and Downsample it to the original. If the resulting and original are the same (or close enough), it is very likely that you have a lower resolution image....
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3 votes
Accepted

Interactively deleting tiles of aerial photographs using ArcGIS Desktop?

Follow this steps: 1) Create new file Geodatabase. 2) Create raster catalog. 3) Add all of your images into raster catalog. 4) Use "Select feature" tool to select all of your images you wish to ...
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  • 5,642
3 votes

Distortion at edges of planetscope images

This is an effect you can see on older Planet imagery known as vignetting. Fortunately, this only affected older sensors with the classification of PS0 and PS1, whereas all newer satellites (roughly ...
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  • 1,522
3 votes
Accepted

Opening Cities Revealed data from 1990s?

I think that you should contact The GeoInformation Group, publishers of Cities Revealed aerial photography to see if they can provide any insight about their *.crv format.
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  • 63.7k
3 votes

Attribution for Bing maps in QGIS QuickMapServices?

Some layers provided by the QuickMapServices plugin come with Attribution information in the layer properties. Unfortunately the Bing layers do not. Here's what the Bing Maps API Terms of Service ...
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  • 23k
3 votes
Accepted

Should I build pyramids/overviews for the source files or for the virtual raster?

If you have very many raster files and you create overviews for individual images, then the rendering software must open lots of files for constructing a small scale output. In extreme case if you ...
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  • 51.5k
2 votes

Is there a software package that allows users to create map tiles?

The following tutorials might be useful: Creating tiles with ImageMagick or https://github.com/rktjmp/tileup : http://omarriott.com/aux/leaflet-js-non-geographical-imagery/ Creating tiles with GDAL: ...
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  • 121

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