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12 votes
Accepted

Tile names & coordinates relationship

After three weeks of learning about web maps I finally found answers to all of my questions. They will be more in the form of tutorial since this may help some other beginner. First I learned how ...
TomazicM's user avatar
  • 26.2k
5 votes
Accepted

Hosting 100 GB of MrSID files in GeoServer

More than a 1000 (or so) files will be too many for an image mosaic in GeoServer so you will want to create an Image Pyramid. The generally recommended approach is to convert from "exotic" formats (...
Ian Turton's user avatar
  • 82k
5 votes

How to speed up the rendering time to display drone-derived orthophoto in QGIS

You need create overviews/pyramids. You can create them within QGIS in Layer properties / Pyramids. Make sure to use external format to avoid messing up your carefully created, already huge TIFF. That ...
Houska's user avatar
  • 8,066
4 votes

Coloration of orthophoto different between QGIS and ArcGIS

After looking through the layer properties in ArcGIS, I noticed under the Symbology tab that a "percent clip" stretch was applied by default for some reason... I changed it to none, and it looks like ...
Aaron's user avatar
  • 111
4 votes
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Why do RGB values seem very high for my multispectral orthomosaic imagery?

Your imagery is 16bit. 16bit data can contain a lot more information than 8bit. The signed range of integer values that can be stored in 16 bits is −32,768 to 32,767 and the unsigned range is 0 to ...
user2856's user avatar
  • 66.8k
4 votes

How to determine the date of the Bing imagery for an area in 2022?

Let's say you are browsing bing.com maps. If you enable the developer tools in your browser, you can find the x-ve-tilemeta-capturedatesrange tag in the response headers with a tile date ranges. ...
Comrade Che's user avatar
  • 7,251
3 votes

Identifying and Placing Points on DEM Features using ArcGIS Desktop?

Lots of ways to try to get at this: Topographic Position Index http://www.jennessent.com/downloads/tpi-poster-tnc_18x22.pdf Elevation residuals (DEM minus a smoothed version of DEM) Local maxima (...
Jae's user avatar
  • 1,302
3 votes
Accepted

Geoserver WMS raster problem

In the imagemosaic setting (in the layer page), try setting "output transparent color" to black
Andrea Aime's user avatar
  • 17.5k
3 votes

Measure an angle on an orthophoto or on a dense cloud

You can use field calculator to calculate the angle using this formula, where b is the horizontal length from one green cross to the next and a is the hight difference (vertical distance, the dotted ...
Babel's user avatar
  • 72k
2 votes

Geoserver WMS raster problem

Does the data get reprojected? Typically when I reproject raster to a different coordinate system I get black edges like that, because the raster file itself is rectangular, but the area covered by ...
Mark Ireland's user avatar
  • 13.2k
2 votes
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Define characteristics (wave lengths, etc) of bands created by split order in Orfeo Toolbox

The split image application split image's bands in the order in which it is encoded in the image file. To know which bands corresponds to which wave lengths you need to refer to the metadata ...
Manuel Grizonnet's user avatar
2 votes
Accepted

QGIS upload Ortho NAIP raster layer problem - loaded a raster file, georeferenced, however is blurry

NAIP imagery is generally 1 meter resolution (some of this year's collection was at 60cm). The MrSID compression used to create the county mosaic you downloaded from the USDA Geospatial Data Gateway ...
Bjorn's user avatar
  • 2,609
2 votes
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Photomosaic non-georefferenced images using open-source software

You have Open Drone Map to georeference photos and create Orthomosaic. You can do in you machine with Open drone Map desktop or ODMWeb. ODM Desktop works in linux, so if you have a different OS you ...
aldo_tapia's user avatar
  • 13.7k
2 votes

Can't generate true orthophoto from my software

While I understand it is about pricing and the cost but have you looked at it here http://www.ips-match.com/ I myself have not tried this since I only use ERDAS or ENVI. You can try and google "...
PROBERT's user avatar
  • 4,139
2 votes
Accepted

Downloading map from ArcGIS Server?

The map service isn't designed to download the entire dataset in one go. It can probably be done with some scripting and the rest endpoint, https://gis2.maine.gov/arcgis/rest/services/megis/...
Dowlers's user avatar
  • 2,334
2 votes

QGIS displays orthophoto distorted

solved: image was not made with EPSG:4326; correct coordinate system EPSG:31466 used and everything is OK now.
fraktal's user avatar
  • 31
2 votes

Combining multiple mosaics into single one using ArcMap?

You could try running the build footprints tool before completing the mosaic. This should effectively remove the black "NO DATA" borders around the individual image mosaics before completely the ...
Keagan Allan's user avatar
  • 3,756
2 votes

Orthorectifying or Georeferencing aerial photographs

It's hard to answer this question without seeing the images, but I'll try. For orthorectification, you need to know internal orientation, deduced from the camera, and external orientation parameters. ...
Yaroslav's user avatar
  • 864
2 votes

Sources for Free High-Resolution (4m or below) Orthophotography (Aerial Photography)

You can try the USGS data portal: https://earthexplorer.usgs.gov/ I have acquired data below 4 m from the site. You use their search tool and select what you are interested in and apply the proper ...
R. Ian Cunningham's user avatar
2 votes

How to determine the date of the Bing imagery for an area in 2022?

Using the Bing Map Metadata service https://docs.microsoft.com/en-us/bingmaps/rest-services/imagery/imagery-metadata It is possible to use vintageEnd this is the latest date found in an imagery set ...
Mapperz's user avatar
  • 50k
2 votes
Accepted

Which band is which in an RGB image

Usually its in order - R, G, B, and then any fourth band is a transparency band (often referred to as A). But without documentation or a file to look at, impossible to be certain. Check the ...
Spacedman's user avatar
  • 64.6k
1 vote
Accepted

Sources for Free High-Resolution (4m or below) Orthophotography (Aerial Photography)

Earth Explorer has 1m NAIP imagery for the US.
Aaron's user avatar
  • 51.7k
1 vote

How to import orthomosiac from metashape into QGIS and preserve ortho appearance?

Try exporting without alpha channel from metashape. When we had similar problems this seemed to solve it. In the export dialog you can uncheck a checkbox. The observed difference from gdalinfo shows ...
MoreIT's user avatar
  • 21
1 vote

Rotating orthophoto based on polygon boundary (rotated pixel)?

Pixels can't really be rotated. SOCKET SET obviously rotates the image on the client side instead of making the TIFF file to have physically north up pixels. You can get a neat line with clients that ...
user30184's user avatar
  • 66.8k
1 vote

Hosting 100 GB of MrSID files in GeoServer

For publishing Orthophotos or Aerials or Satellite Imagery I like to make XYZ or TMS PNG or JPG Tiles. Server those out of AWS S3 Bucket. Skip GeoServer, GeoWebCache and PostGIS and deliver an Google ...
Geospatial Engineer's user avatar
1 vote

Hosting 100 GB of MrSID files in GeoServer

Using Ian Turton's answer I was able to write a script that converted the MrSid files to GeoTiffs and then create a pyramid. I couldn't get GDAL to work with the Lizard Tech SDK, so I had to use ...
SwiftD's user avatar
  • 33
1 vote

Hosting 100 GB of MrSID files in GeoServer

Per the GeoServer documentation, GeoServer has an ImageMosaic data store which will support these MrSid files, providing the GDAL extension is also installed. Given that you already mentioned ...
JasonInVegas's user avatar
  • 1,835
1 vote

Removing all pixels at apprx. ground level in orthomosaic?

You do not need the orthomosaic to do what you want to accomplish. What you need is to export from photoscan the pointcloud as a LAS file. This kind of file is for LIDAR data, but you can also use ...
Gerardo Jimenez's user avatar
1 vote
Accepted

Determining acceptable RMSE for Orthorectification?

RMSE represents the square root of the average of the set of squared differences between elevation model coordinates and ground truth - that is, the control elevation model or raster to which you are ...
AlecZ's user avatar
  • 2,633

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