Linked Questions

5
votes
1answer
11k views

Convert 0's to NoData in QGIS Raster Calculator [duplicate]

What is the easiest way to convert cells with a value of 0 to NoData in QGIS Raster Calculator?
13
votes
1answer
2k views

Working with NaN/null and different extents in QGIS Raster calculator?

When it comes to NULL value and different extents of rasters I find it extremely cumbersome to use QGIS raster calculator. As far as I am aware there is no way to operate with NaN/Null value. So no ...
1
vote
1answer
788 views

QGIS Zonal Statistics and No_data

I think QGIS Zonal Statistics algorithm does not handle No_data values correctly. The expected behaviour is that if I set some raster cells to No_data (for example with the method suggested here, ...
4
votes
1answer
705 views

Cropping raster and merge it to overlapping DEM?

I am working with an existing DEM of a river and its surrounding area in QGIS (actually a virtual raster from four separate DEM TIF tiles). My goal is to add a bridge's profile to the DEM. I have a ...
2
votes
1answer
533 views

Clipping raster by points in QGIS?

I'm downloading a point-dataset as an x,y,depth .csv-file. I'd like to interpolate these and use them as an nautical navigational chart. The problem arises on interpolating the points into a raster (...
3
votes
1answer
347 views

How to perform IDW interpolation on ocean data points without interpolating on land?

I am using QGIS 2.14 Essen. I am working on ocean data points and I would like to interpolate them to create a raster. The problem is, when I do the interpolation, the areas where there is land are ...
2
votes
1answer
359 views

Select country boundary from a raster and convert this to a polygon?

I have a DEM raster file of a country. From this, I want to produce a polygon shapefile which only contains the land boundaries of the country. My idea is to select the parts of the raster which ...
1
vote
1answer
301 views

Vegetation removal from DEM before or after contour line extraction

I have a DEM from a terrassed olive grove (single trees apart from each other) and would like to get clean contour lines (without trees / bushes) from it using QGIS3. Cleaning up all the contour lines ...
0
votes
2answers
189 views

Deleting values less than 0.31 in NDVI raster layer in QGIS

In my research I have a Ndvi raster layer, and I want to delete the values corresponding to bare soil, which are those minor of 0.31. Therefore, I will obtain a new raster layer with those values ...
2
votes
1answer
117 views

Is there a version of the NLCD that doesn't have developed areas?

I'm currently working on a personal project that requires that I remove the developed areas from the NLCD. I'm currently using the 2011 data, and I have some solutions in my head that might work, but ...
-1
votes
1answer
45 views

Merging shapefile and raster file and export it as single PNG via PyQGIS [closed]

I have one temperature raster file and one shapefile containing country borders. I want to create a single file by merging the shapefile with the raster file and I export it as a PNG file. I want to ...
1
vote
1answer
38 views

Obtain coordinates with specific NDVI value using QGIS?

I made new layer for NDVI. Now, I have to get coordinates for some range of NDVI. Let's say I have to get coordinates for NDVI from 0.1 to 0.3. How I can do it? I saw several YouTube tutorials - but ...
1
vote
0answers
48 views

No Data Analysis In QGIS

I have two rasters and am using QGIS 3.6 I want to know which areas in raster 1 that are "no data" are not "no data" in raster 2. I also want to know what areas in raster 2 that are "no data" are ...
-1
votes
1answer
31 views

Change pixel values of the open Sea to noData values

I want to calculate, which land areas of my elevation raster data set are under a specific elevation height. The open sea with pixel values of 0 should not be included in the analysis. I want to ...
1
vote
1answer
22 views

How to transfer NaNs from raster to other having different dimensions?

I have one high resolution raster 1m with dimensions 12671x12756 and other a Sentinel 2A raster with dimensions 1606x1596. Both of them are of same extent but the high-res tiles has some nans and I ...