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Results tagged with qgis
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user 92448
QGIS is a cross-platform GIS application licensed under the GNU General Public License.
0
votes
Create star map with polar projection from Right Ascension and Declination
I downloaded the Yale Bright Star Catalogue, and converted it to a csv file that I could use in Excel and in QGIS. … Then import it into QGIS, using the converted Right Ascension as the x-value and the Declination as the y-value. …
- 393
1
vote
0
answers
160
views
Using decimals in QGIS raster calculator
I am using the QGIS raster calculator to change the values of pixels of a specified value to a different value. … Any ideas on what is happening or is there a better way to change the values of pixels in QGIS?
The raster calculator seems to be a quirky tool. …
- 393
4
votes
1
answer
2k
views
Changing nodata pixels of -3.40282347e+38 to a different number in QGIS
This happened because I am using -32768 as my nodata value, and the georeferencer in QGIS adds nodata pixels as -3.40282347e+38. … If the no data value is -32768 (or any other reasonable number), it is easy to change the value of the no data pixels into any other number using the raster calculator in QGIS. …
- 393
9
votes
5
answers
7k
views
QGIS: How to shift a raster?
I tried to create a world file, as is suggested here, but neither Raster: Conversion: Translate in QGIS nor GDAL Conversion Translate in the Processing Toolbox created a world file when saved in the suggested …
- 393
0
votes
What to do with -3.4e+38 nodata values?
The answer to this question would probably also solve this problem:
Changing nodata pixels of -3.40282347e+38 to a different number in QGIS
In summary, you can use r.null from processing toolbox to change …
- 393
14
votes
Georeferencing vector layer with control points using QGIS?
Several of the answers provided here are no longer options for QGIS 3, and/or only allow for linear transformations of the vector file being georeferenced. … I used the
Georeferencer GDAL plugin in QGIS. This is available under the
Raster dropdown menu, after it is installed using the Plugin manager. …
- 393