All Questions
Tagged with masking raster-calculator
8 questions
1
vote
1
answer
487
views
How to make certain part of raster as no data with other overlapping raster?
I have two rasters, one raster contains all the ground features (roads, buildings, Trees etc) and another raster contains only man made features (Roads, buildings etc). I would like to have raster ...
- 21
3
votes
2
answers
346
views
Conditional calculation using QGIS
I want to apply an algorithm to calculate the clorophyll-a concentration of a reservoir using Sentinel 2.
To do this I need to create a mask using Sentinel's 2 band 11(infrared) to separate the water ...
- 33
0
votes
1
answer
177
views
Give non-overlapping parts of 2 rasters a value 0 (QGIS)
Is there a way in QGIS to give non-overlapping parts of 2 rasters a value of 0 in the new raster file?
I would like the data gaps in the velocity file (so where Ice mask is displayed on the chart) ...
- 187
0
votes
1
answer
500
views
Land masking in ArcGIS Raster Calculator?
I'm trying to mask land in a raster and just wondering if anyone knows how to do this. I tried using the raster calculator by producing a new raster based on a threshold value but my output raster is ...
- 507
2
votes
1
answer
952
views
How to force 1 bit GeoTiff (binary image) outputs from QGIS processing in Python console?
In a QGIS Python script I'm trying to produce raster 0/1 mask with use of procesing package. The pipeline looks like that:
Create an image of index (NDSI if that matters) with numpy arrays from a ...
- 327
2
votes
1
answer
994
views
QGIS Treat null as zero in raster calculator
In QGIS - I have an irregularly shaped raster - I wish to clip an irregular area out of it (call it raster A) with that area set to null.
I masked the area (vector polygon) I want to remove and used ...
- 447
7
votes
3
answers
10k
views
Changing raster cell values within polygon using QGIS GUI
How do I change the values of raster cells which are within a polygon, leaving all cell values outside the polygon unchanged?
I would like to subtract 1.5m from each raster cell value within the ...
- 450
5
votes
1
answer
6k
views
How to reclassify raster inside polygon mask, leaving values outside as they are?
I am in the final stages of a landcover classification and need to reclassify thematic raster values that are inside different polygon masks, while leaving the values outside as they are.
Can I do ...
- 51