Skip to main content
Geographic Information Systems

Questions tagged [formula]

Ask Question

The tag has no summary.

37 questions
Newest Active Bountied Unanswered
0 votes
0 answers
44 views

D is my Distance Raster (Dras). it is made. I need help putting the formulae below into ArcGIS Pro Python or a raster calculator expression in ArcGIS Pro. It should only run on values where Dras < ...
If you do not know- just GIS's user avatar
  • 7,496
0 votes
1 answer
49 views

I'm trying to calculate a percentage of a filter against a total number and show in symbology so total number 583269 (Plots) formula is "Column A" > -123 (gives a result of 582962) I ...
Soup Dragon's user avatar
  • 11
0 votes
0 answers
72 views

I am trying to write a script that will automatically calculate the amount of random samples needed to compare my derived DEM data against my truth datasets. The DEM data can vary in resolution from ...
Noah P's user avatar
  • 59
0 votes
1 answer
129 views

What is the correct way to introduce this formula in the raster calculator? It is the formula in order to calculate m-coefficient for L factor for RUSLE model. O = slope in degrees I tried multiple ...
gis1234's user avatar
  • 319
1 vote
1 answer
1k views

I want to manually convert coordinates (latitude-longitude in degree decimals) data into Lambert Conformal Conic (more precisely, EPSG:3347). I already know how to use GIS software functions for ...
Bastien's user avatar
  • 659
2 votes
3 answers
479 views

I'm currently using QGIS 3.30 and I'm trying to set a default value for a field based on multiple other fields, without having the default value update automatically whenever an attribute of the ...
MartinMap's user avatar
  • 8,284
3 votes
1 answer
790 views

My Dataset contains the field "length" with numbers from 1 to 100. I just want to filter data which are greater than 50 or which are less than 50. I just use the formula: "Length" &...
Bruno B's user avatar
  • 879
2 votes
1 answer
214 views

I am trying to calculate standard deviation (observed - mean)/(mean)*100 but I noticed the part where you ".divide(longTermMean)", the math results results are incorrect. I tested out ...
Mas's user avatar
  • 33
1 vote
1 answer
725 views

I'm trying to use the modeler in QGIS to calculate the NDVI on a raster image. The model is the one below: In the "NDVI Calculator" algorithm I have set the parameters like this. The ...
Enrico's user avatar
  • 19
1 vote
1 answer
152 views

I'm trying to calculate this formula in GEE: ∑ U(U-5)^2 (u is wind speed greater than 5) when I use (.add) in my code it just give me a pixels that are greater than 5 in both of them at the same but ...
Sajjad's user avatar
  • 61
2 votes
0 answers
382 views

What is MCARI's standard range of high and low value. Like NDVI range is from -1 to +1, so is it from -1 to +1 or different because when I am calculating it my range goes up to in thousands. Also if ...
Ansharah's user avatar
  • 21
1 vote
1 answer
231 views

I want to use Raster Calculator in my Python script in QGIS. The expression is easy - I want to create a new raster with two values (0,1) where I get 1 if the pixel value is higher than a certain ...
Siti's user avatar
  • 37
1 vote
1 answer
2k views

I am trying to calculate NDRE and RECI using Sentinel imagery ON ArcGIS software . For RECI( RED EDGE CHLOROPHYLL INDEX) the formula is (NIR/RED-1). Can you tell me which band to use in order to ...
ANSHARAH MOBEEN's user avatar
  • 11
0 votes
0 answers
118 views

I'm looking for raster calculator expression which includes the "STATISTICS_MEAN" value from the raster properties. How can I build the expression, that the value is automatically adapted? I ...
Hardau's user avatar
  • 101
2 votes
1 answer
559 views

I am trying to calculate EBBI from Landsat 8 in Google Earth Engine (GEE) but I am getting this error: Error: Image.parseExpression: Expression parse error at character 30: '(SWIR - NIR)/ (10 * Image....
Dolby's user avatar
  • 1,284

15 30 50 per page
1
2 3