arma3:terrain:qgis-real-world-data-tutorial
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arma3:terrain:qgis-real-world-data-tutorial [2019-03-31 22:28] snakeman added new update from ross. |
arma3:terrain:qgis-real-world-data-tutorial [2022-01-04 05:59] (current) snakeman opentopo 404 link and typos fixed. |
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| ===== Heightmap: ===== | ===== Heightmap: ===== | ||
| - | This tutorial covers single raster heightmap as per the kind you will find on opentopo [[http://opentopo.sdsc.edu/raster?opentopoID=OTSRTM.082015.4326.1|here]], I will detail steps for heightmaps spread across muliptle rasters in another update. as they will require additional steps likely including Merge / Build Virtual Raster commands. This section does not cover any re scaling of heightmap, which I would recommend against anyway. Remember [[https://pmc.editing.wiki/doku.php?id=arma:terrain:grid_cell_size|Grid size x Cell size]] should = the same size (meters) as your source heightmap selection. | + | This tutorial covers single raster heightmap as per the kind you will find on [[https://portal.opentopography.org/raster?opentopoID=OTSRTM.082015.4326.1|opentopo]], I will detail steps for heightmaps spread across multiple rasters in another update. as they will require additional steps likely including Merge / Build Virtual Raster commands. This section does not cover any re scaling of heightmap, which I would recommend against anyway. Remember [[https://pmc.editing.wiki/doku.php?id=arma:terrain:grid_cell_size|Grid size x Cell size]] should = the same size (meters) as your source heightmap selection. |
| **Drag and drop your heightmap '.asc' into QGIS** | **Drag and drop your heightmap '.asc' into QGIS** | ||
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| {{https://pmc.editing.wiki/images/Ross-QGIS-Tutorial-AdvancedDigitizing.gif}} | {{https://pmc.editing.wiki/images/Ross-QGIS-Tutorial-AdvancedDigitizing.gif}} | ||
| - | After the last **left mouse click** from the step above, the tool is still waiting to plot more points, so to finalise the square do a **right mouse click** | + | After the last **left mouse click** from the step above, the tool is still waiting to plot more points, so to finalize the square do a **right mouse click** |
| {{https://pmc.editing.wiki/images/Ross-QGIS-Tutorial-20b.png}} | {{https://pmc.editing.wiki/images/Ross-QGIS-Tutorial-20b.png}} | ||
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| import os\\ | import os\\ | ||
| - | os.system(r%%'''%%gdalwarp -t_srs EPSG:**32620** -wo SOURCE_EXTRA=1000 -tr **5.0 5.0** -srcnodata "-9999" -r cubic -of GTiff -te **576787.687480 1841104.815839 597267.687480 1861584.815839 D:/Arma/Heightmaps/Opentopo/output_srtm.asc** **D:/Arma/QGIS/Montserrat/converted.tif**%%'''%%) | + | os.system(r%%'''%%gdalwarp -t_srs EPSG:**32620** -wo SOURCE_EXTRA=1000 -tr **5.0 5.0** -srcnodata "-9999" -r cubic -ot Float32 -of GTiff -te **576787.687480 1841104.815839 597267.687480 1861584.815839 D:/Arma/Heightmaps/Opentopo/output_srtm.asc** **D:/Arma/QGIS/Montserrat/converted.tif**%%'''%%) |
| Some explanation of the key parameters: | Some explanation of the key parameters: | ||
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| ==== For single tile export ==== | ==== For single tile export ==== | ||
| - | **Load in just the '.map' files generated from Terra incognita into QGIS** | + | **Load in just the '.map' files generated from Terra Incognita into QGIS** |
| {{https://pmc.editing.wiki/images/Ross-QGIS-Tutorial-1b.png}} | {{https://pmc.editing.wiki/images/Ross-QGIS-Tutorial-1b.png}} | ||
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| - | Before loading the satellite image into Terrrain Builder delete the .bmp.aux file | + | Before loading the satellite image into Terrain Builder delete the .bmp.aux file |
| {{https://pmc.editing.wiki/images/Ross-QGIS-Tutorial-08.png}} | {{https://pmc.editing.wiki/images/Ross-QGIS-Tutorial-08.png}} | ||
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| You can also export your terrain to a browser interface if you want - **File** > **Export to web** | You can also export your terrain to a browser interface if you want - **File** > **Export to web** | ||
| - | **Coming Soon:** | ||
| - | * Assisted image classification - for creation of mask | ||
arma3/terrain/qgis-real-world-data-tutorial.1554071327.txt.gz ยท Last modified: 2019-03-31 22:28 by snakeman
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