All Questions
16
questions
-2
votes
2
answers
335
views
Extracting minimum pixel value from multiple rasters
I am trying to extract minimum values from about 300 raster files (GeoTIFF) - for example an output table containing raster names against their minimum values. I would like to automate the process. I ...
- 81
3
votes
1
answer
469
views
Invert raster's min with max values (as well as the in between values) and vice versa using R
I have a raster with pixel values, 1 to 255 (no decimals). I want to invert their values in a way that pixels with value 1 will get value of 255, pixel with value 2 will get 254, pixel with value 3 ...
- 1,093
1
vote
1
answer
4k
views
How to get the number of pixel with a given value from a RasterLayer in R?
I'm working with Corine Land cover data. I want to assess the number of pixels with any forest value (311, 312, 313, 321, 322, 323, 324) of two reference years. That's wat I did:
clc00 <- raster(&...
7
votes
2
answers
407
views
Classifying raster layer by number of equal values in given area using QGIS
I am using QGIS 3.16.12 - Hannover. I have a binary raster layer which consists of 2 values, either 0 or 1 (in my screenshots, 0 = black, 1 = white). The 1 values are scattered throughout the layer in ...
- 113
0
votes
0
answers
423
views
Changing raster pixel values outside of polygon box using rioxarray
How do I change all raster pixel values outside of a polygon (keep the original values inside polygon) into a certain value?
I have passed through rioxarray clip() like below from this link:
...
- 67
0
votes
0
answers
83
views
Projecting raster changes the range of values
I am trying to project a 1 second DEM from GDA94 to UTM56 in ArcMap using the Project Raster tool. I tried different methods: bilinear, cubic, nearest neighbor. Nevertheless, the values of the output ...
- 31
0
votes
0
answers
119
views
MOD04_L2 data processing in r
i am new to using r, so i excuse in advance for asking basic question. I have been trying to convert MOD04_L2 data into GeoTIFF and extract value to a district shapefile in R. the coding seems to work ...
0
votes
0
answers
57
views
Adjusting pixel values to new pixel sum
I'm working with land use rasters in QGIS. For my application I have created rasters with pixels that have a fraction of 0-1 (for 0-100%) for a land use class. So for example in my settlement raster ...
- 1
1
vote
1
answer
174
views
Reprojecting a raster results in larger raster values than the original raster values [duplicate]
When I reproject a raster in ArcMap using the project raster function (details in the image above) to change its X,Y coordinate system from North_America_1983_Transvers_Mercator to NAD_1983_Idaho_TM, ...
1
vote
1
answer
309
views
QGIS Legend only with Raster Minimum and Maximum values
I want to have a mimim and maximum raster values in the legend but it appears to me a long list of all values how can I resume the legend minimum and maximum values:
- 413
0
votes
2
answers
857
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 ...
- 63
1
vote
1
answer
819
views
Exctracting values and their coordinates from a raster layer in QGIS?
I would like to extract the pixel value and coordinates of each of them from a ndvi raster layer. I don't have a point layer from where I can extract those values, as I read in other posts.
...
- 63
1
vote
1
answer
2k
views
QGIS-Export Raster Values to a .csv file
I use a Raster, based on .png and .pgw file. (plans from a town)
The plans include information about where buildings are allowed to be built and maximum building height, ground elevation etc.
Now i ...
- 19
3
votes
2
answers
921
views
PostGIS: Change raster values depending on values from other raster
I have two rasters and I want to change all the values from "raster1" to 4, where they are larger than the values from "raster2" and to 0, where they are smaller.
So raster2 has only one value, which ...
- 31
4
votes
1
answer
419
views
Return a set of unique pixel values in a raster with PyQGIS? [closed]
I am trying to test whether a value exists in a raster against all the values present. I am using pyqgis (Python 2.7) in in QGIS 2.14. I have found a number of ways to get point location values and ...
- 131