Questions tagged [raster-calculator]
A tool in some GIS software programs for performing algebraic operations on rasters.
2
votes
1answer
18 views
Using ArcGIS ModelBuilder iterator to for Raster Calculator?
I have a raster that I need to divide by X in a model. I have hundreds of values I need to divide it by. What I am trying to do is create a list of values, and use the iterator to loop through them ...
0
votes
1answer
25 views
Raster Calculator giving inccorect results with large numbers
I am attempting to multiply my raster values by 10000 using the raster calculator in QGIS 3.6.2. But am getting weird results. For example I have an initial raster value of 30303 and would expect a ...
1
vote
0answers
21 views
Reprojected raster return only zeros from QGIS raster calculator
I am experiencing an issue when trying to use my reprojected raster in QGIS raster calculator; First, my raster is reprojected from degrees to meters. After that, I want to process the layer by ...
0
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0answers
23 views
Using Raster Calculater to create .asc files in QGIS?
I have been trying to create an .asc file that contains the difference between two others. This can be represented as C=A-B. All files have the same size.
When using the Raster Calculator built into ...
1
vote
0answers
14 views
How to use the Raster Calculator in PyQGIS (Console) in QGIS 3?
I want to use a script to do some raster calculations. I found this and this posts which seem to answer this question, however, it seems that they work for QGIS 2 and not for QGIS 3. I think the ...
0
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0answers
15 views
Intersect multiple binary rasters based on certain criteria in ArcMap
I have multiple binary raster image (0.1). For example if I have n images, how can I extract the pixels that has the value of 1 and frequently occurred " the same pixels" in 70% of the n images (for ...
0
votes
1answer
17 views
GDAL Calc Set Specific Values to Another Number
I have a GeoTiff raster with a format of Float32 and values 0.00 to 5.00. I am attempting to change all raster cells with a value below 0.10 to 0.10, and leave all other cells in the raster dataset ...
1
vote
1answer
31 views
PyQGIS problem with QgsRasterCalculator CRS definition
from qgis.analysis import QgsRasterCalculator, QgsRasterCalculatorEntry import processing
from osgeo import osr, gdal from gdalconst import *
dataset1 = gdal.Open(input1, GA_Update) band1 = dataset1....
1
vote
2answers
57 views
QGIS - raster calculator syntax
I am having problems using the raster calculator. Some pixels of my GeoTIFF file have the value 255 on bands 1, 2 and 3. I want to replace this value with 0 on the three bands.
I tried with this ...
2
votes
1answer
31 views
Sum multiple rasters using raster calculator, the result raster had a larger cell size?
I have 365 rasters (daily) and therefore I summed them to form an annual raster using raster calculator in Arcgis. The original cell size of daily raster is 5*3.75 (col 72, row 48), while the cell ...
1
vote
1answer
51 views
QGIS 3.6.2 with GRASS - raster calculator - Raster1 + Raster2 returns missing pixels
I have 5 large point datasets (shapefiles) and I'm interested in getting a heatmap on the combination of all 5 point layers.
I use the QGIS heatmap tool to create a heatmap on each layer. This is ...
2
votes
1answer
37 views
Replace the empty cells of one raster with the values of a second raster
I have 2 rasters with the same extent. In the first raster, there are a lot of empty cells that I want to replace by the values of the second raster.
I have tried Raster calculation with the following ...
0
votes
0answers
17 views
Losing raster quality when using raster calculator (ArcGIS Desktop 10.5.1)
I'm currently working with DEM rasters that I hillshaded. The data I received contain nodata borders, probably the footprint of the originial mosaic dataset. As I received them separately, I can't ...
1
vote
1answer
56 views
Using ArcGIS Pro raster calculator to give cell value based on cells in its neighborhood?
I have a land cover dataset, I want to find forested cells that are adjacent (touch) agricultural cells.
Is there a way I can achieve this with the ArcGIS Pro raster calculator?
0
votes
1answer
31 views
Switching Mars DEM elevation values from negative to positive?
I'm using a DEM of Mars I got from UA's HiRISE website, and I want to convert it into an STL for 3D printing using the DEMto3D plugin.
However, the raster values are all negative, so I thought I ...
2
votes
0answers
33 views
Writing Raster Calculator Expression?
I use ArcMap 10.3.
How do I create an expression in RasterCalculator that allows me to sum up 4 rasters (every pixel has an associated value) and the result to be 0 if any of the 4 values is 0?
For ...
0
votes
1answer
22 views
Creating new raster with minimum (or maximum) value betwen two rasters in ArcMap?
I am using ArcMap 10.3.
I have two temperature rasters from two months. I need to create a new raster from these, but the new raster should have in each cell the maximun value betwen the initial ...
2
votes
1answer
30 views
Raster calculator - set default output path - QGIS 3.4.6
Raster calculator: How can I set the default output folder?
By default it's set to "C:\Program Files\QGIS 3.4\bin"
I'm using QGIS 3.4.6
2
votes
0answers
38 views
Confusing result of raster calculator in QGIS
I'm confused about the results that I get from the raster calculator in QGIS.
I'm trying to delete the cells of a raster who are prone to flooding. However, a part of my raster is wrongly classified ...
1
vote
0answers
12 views
Discrepancy between raster calculator and geomorphic change detection elevation change results
I am using two rasters to determine the elevation change in a stream channel.
When I used the Geomorphic Change Detection Software add-in (version 7.4.1), I got a high elevation change of 8.8 ft and ...
2
votes
1answer
44 views
Counting .tif value in polygon in QGIS
I am trying to count raster values (from a .tif file) in polygons. In previous posts that people suggested using the 'zonal statistics' plugin in QGIS. However, I couldn't find it in my plugin manager ...
1
vote
1answer
41 views
Ordered weighted averaging error QGIS
I am trying to use Ordered weighted averaging to sum up values across different raster overlays in QGIS 3.4.4, but I get this error:
Traceback (most recent call last):
File "C:/PROGRA~1/QGIS3~1.4/...
0
votes
0answers
39 views
From raster to polyline in QGIS
I'm trying to extrat ridges from ALOS images on qgis.
I would like to have polylines so I can use the plugin AutomaTracks from Sebastien Peillet.
I did inversed the MNT using raster calculator then ...
0
votes
2answers
19 views
Performing Raster Calculation?
This is my formal:
("Standort_ger_fre_mosaic" ^ 0.4) *
("Habitattradition_raster_rec.tif" ^ 0.3) *
("Vollständigkeit_rec.tif" ^ 0.1) *
("Vorkommen_ungestörter_Lebensräume_rec.tif" ^ 0.1) *
("...
0
votes
1answer
30 views
ESRI Raster Calculator error “Con()”
I"m trying to nest expressions in this raster calculator conditional statement, but I get an error.
This statement works, so I tried to follow it as a template:
Con (IsNull("ras1"),"ras2","ras3")
...
0
votes
1answer
63 views
ArcMap Raster Calculator with Python code
I'm trying use raster calculator that can export a raster to do different average values for for multiple layers. For example, I want to do averages for only the values and layers that are greater ...
2
votes
1answer
60 views
Getting rid of cells of 0 values in raster using QGIS?
I have a DEM like below image. The black area shows 0-values.
I want to remove cells of 0-values in the raster.
In raster calculator, I wrote con("demclip_re@1">0,"demclip_re@1") but it gives "...
1
vote
1answer
63 views
Getting QGIS Model Processing Raster Calculator Error?
I am using "raster calculator" tool of the saga in my model. The tool correctly executes raster operation like "a * 2" in value formula option but the same expression is not executed pre-calculated ...
0
votes
0answers
19 views
Con statement with multiple AND fails
I have a conditional statement that runs through multiple rasters. It produces the correct output in Raster Calculator but not when I run the code. I don't get any errors, it just creates blank ...
1
vote
1answer
45 views
Solving ERROR 000732: Input Raster: Dataset Con( does not exist or is not supported in for loop? [duplicate]
I'm trying to reclassify rasters based on standard deviation. I created this code, but I think I'm wrong using "Con". I would like to assign value 1 to rasters >= to threshold and rasters <= to ...
1
vote
1answer
29 views
How to stack points based on their latitude and longitude value on a raster image in QGIS
I have a Sentinel2 image. I have a CSV file that contains latitude, longitude and precipitation data over the location where the sentinel2 image was taken. Now I want to stack the precipitation data ...
1
vote
0answers
19 views
Attribute Table missing After Raster Calculator?
I want to remove zero value pixels from MODIS LST raster images and apply a moving window that can only substitute the missing values and leave the other original values with out alteration. I have ...
1
vote
0answers
29 views
Checking for exact value in QGIS raster calculator
I would like to single out values which are equal to a certain floating point value using QGIS raster calculator. I tried to run the following:
"Converted@1"==-3.40282347*10^38
But I got the error ...
0
votes
2answers
63 views
Pixel depth and raster output won't align with the original
The problem
Need to convert a raster .tif tile (DOWNLOAD) from WGS84 to GDA94 Albers;
Need to convert its stored pixel info from Float32 to 8 bit UNSIGNED;
Need Compression set to "NONE";
Need to ...
1
vote
1answer
39 views
How do I build a new raster based on raster stats in QGIS?
I want to create a new raster that uses the mean value of the original raster as the base class of the image and then uses a +- 1 and 2 standard deviations as the other four classes of the image. Is ...
1
vote
2answers
40 views
Replacing value of specific pixel using raster mask in ArcGIS Desktop?
I have two rasters: the first is a basin with all pixels values equal to 0. The second raster (mask) has a single pixel with value = 1. In fact, I need only one raster where all the pixels into the ...
1
vote
0answers
153 views
QGIS RASTER CALCULATOR - Getting the Minimum and Maximum Values of a Raster Layer
I try to work with the minimum and maximum values of a raster layer in the raster calculator in QGIS 3.6. I try to do the following formular:
( @RasterCellValue - @RasterMinValue ) / ( @...
3
votes
2answers
160 views
QGIS Version 3.6 Raster Calculator
In the previous version of QGIS when you loaded a multiband color image into raster calculator the bands were separated.
In version 3.6 I am only seeing 1 band how do I get the other bands displayed ?...
1
vote
0answers
133 views
QGIS Raster Calculator missing bands
I've created a VRT from some 6-band TIFF tiles. The VRT displays perfectly in QGIS 3.6 and I can see manipulate the band arrangement and create different composites.
However, when I open the raster ...
0
votes
0answers
40 views
ModelBuilder and Raster Calculator Error 000539?
I'm currently working in ModelBuilder trying to use the Raster Calculator and I keep getting the error message 000539. The error according to ESRI says it's an invalid pathway. What I have circled ...
2
votes
0answers
40 views
QGIS Problem adding two rasters
I have a DEM of terrain that I have successfully added a raster of woodland to:
I am trying to add to that a raster of a built up area, but the extent of the settlement raster is smaller than my ...
1
vote
0answers
70 views
gdal_calc.py result are false and not the same as “direct” calculation
I need to do the raster calculator operation as "raster + constant" in Python. The input rasters are DEM data with float original type and -9999 for the NoData. The constant is float too.
In 1st way, ...
0
votes
0answers
29 views
Calculating Raster Percentile Values in ModelBuilder
I want to calculate the 75th percentile value of a raster dataset (floating, 32Bit) and use this value as an input to a set null expression. I have multiple rasters to perform this on so I need to ...
1
vote
1answer
128 views
Calculate percentile value of raster
I want to set null all raster values that fall below the 75th percentile value. E.g. If you classify the raster by quantile method into 4 classes I want to be left with the top 25% percentile. For the ...
2
votes
1answer
65 views
Combining overlapping rasters in ArcGIS
I have two DSM rasters, one is 10km radius photogrammetric data, the other is 2km radius LiDAR data, both centred around the same point.
I need to combine these together, essentially inserting the ...
1
vote
2answers
111 views
How to create a single raster based on the values of three rasters (Conditional)?
I have three rasters of soil granulometric fractions (clay, sand and silt), all in %. I want to make a single raster of the soil texture classes. For that, I need to make some conditionals (i. e.: ...
0
votes
0answers
47 views
NDSI Classification : Output Raster <empty>
I generated an NDSI image in GeoTiff format that have values ranging from -1 to +1 . Now, I want to classify the image using a threshold of 0.4 to classify it into Snow and Non Snow . For the same, I ...
1
vote
1answer
45 views
Piping one SAGA Raster Calculator output into another chaining algorithms in QGIS processing script?
I am using QGIS 2.18.15.
I want to streamline multiple SAGA raster calculator calculations using the output of one calculation (not loading it into the table of contents) as input raster for the ...
0
votes
1answer
77 views
Adding building and woodland heights to raster DTM using QGIS 2.18.19
I am using QGIS 2.18.19 to produce viewsheds of a proposed development to show where the development would in theory be visible from. I am using Ordnance Survey Terrain 5 as my height data (*.asc) ...
3
votes
1answer
101 views
SAGA Raster Calculator in QGIS Algorithm script produces 'NoneType' object has no attribute 'crs'
I would like to produce a new temporary raster after a calculation with the SAGA raster calculator using a custom python algorithm script. This is my code so far:
##MaechtigkeitunterhalbeinerHoehe=...
