Questions tagged [reclassify]

Changing the values of the cells in a raster.

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3
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0answers
21 views

ArcPy raster Reclassify not covering all cells in raster

I am trying to use Reclassify on 240 rasters using ArcPy within the Python window in ArcMap 10.7. My original raster has continuous decimal probabilities ranging from 0 to 1, and my goal is to change ...
4
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0answers
41 views

Passing list as reclassify input table parameter in qgis.reclassifybytable algorithm

Following up on Save and load the classes definition table in the QGIS reclassify by table tool, I decided to run the qgis.reclassifybytable algorithm using PyQGIS to reclassify an aspect raster. Here'...
3
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1answer
48 views

Save and load the classes definition table in the QGIS reclassify by table tool

I'm reclassifying an aspect raster which cells values ranges from 0 to 359.999 using the Reclassify by table tool: Setting the reclassification table manually is painful, especially when you have ...
3
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1answer
49 views

Extract raster properties and use them in QGIS graphical model

I would like to generate a tool that reclassifies rasters in 10 classes with equal intervals. Since QGIS reclassifies tools does not allow to automatically create classes with such methods, I was ...
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0answers
34 views

ArcGIS - separate/split shapefiles by attribute range and save

Problem: I often have a shapefile that I classify into 3-5 classes based on the values of a specific field. Usually I am interested how many features are in each class and which area has each of the ...
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27 views

Merging overlapping thematic rasters using ArcMap

I want to merge two overlapping rasters. Raster A has 8 classes and raster B has only 1 class. I would like to produce Raster C with 9 classes, where Raster B would overwrite corresponding pixels in ...
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4answers
90 views

Reclassify raster values continuously instead of assigning them to specific groups

I want to create a Habitat Suitability Index (HSI). I have several variables (raster layers containing information about e.g. precipitation, slope, food resources, etc.). I have to create an "...
1
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1answer
43 views

r.damflood in Grass 7

There are 4 required inputs for this addon (r.damflood) in GRASS. elev= elevation raster map (raster file with elevation data) lake= water depth raster map (raster file of only the lake area) ...
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1answer
32 views

Calculating suitable area based on product of 2 binary layers

In QGIS I am attempting to calculate the suitable area based on two reclassified layers (Raster tools -> Reclassify by range) that have been overlaid with SAGA -> Raster calculus -> Product. ...
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42 views

Reclassifying table to get values per cell using ArcMap

I reclassified a utilization distribution (space use; raster) map for an animal with an electronic transmitter, so that its original values fall within three classes: 0-2. When I open its attribute ...
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0answers
18 views

Region Grow on DEM in ArcGIS pro

I'm trying to use the region grow raster function on a DEM in ArcGIS pro. The goals is to use a single seed point to identify all the surrounding cells that are within a certain elevational range (i.e....
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1answer
45 views

Build RemapValue table name in Python script and then access the Remap Table

I have a bunch of rasters that need to be reclassified. I am not sure the best way to create RemapValue tables, but I made them in Excel. I then dumped them in the Python script and they are now ...
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1answer
99 views

How to reclassify Land Corine cover with QGIS 3.10

I am working with QGIS. The land corine cover is a GeoPackage. I would like to reclassify land corine cover into 3 categories. The codes for the three categories are 211, 212 and 313. In order to use ...
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1answer
30 views

Change rasters' z value to minus (Below sealeave)

My current raster has positive values for all features but I need them all to be negative as it is for a seafloor basin. A handful of values are negative but most are positive. I have access to ArcGIS ...
0
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1answer
44 views

Reclassify function in ArcMap 10.5 does not correctly reclassify values?

I reclassified a raster layer containing three classes (0-0.05, color = white; 0.05-0.5, color = dark salmon; and 0.5-1, color = red) to a raster layer where theses ranges were replaced with 0 (color ...
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1answer
46 views

How to add reclassified layer to another layer in Google Earth Engine

Ok so let's just jump right to the script var indon = ee.FeatureCollection('users/sdwijati/IDN_adm2') var Sesar = ee.FeatureCollection('users/sdwijati/Sulawesi_sesar') var nama_prov = ['...
0
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1answer
35 views

R: Substracting rasters by their minimum values (loop over a list)

I'm trying to reclassify a bunch of rasters by substracting the pixels of each of them with their minimum value (eg: I want to substract all the pixels of a raster(A) by its minimum value, same thing ...
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0answers
18 views

Multiple Reclassifications by a variable

I am using Model Builder to reclassify a DEM raster (the input raster is a parameter and may vary in range of elevations). (The model then goes on to extract the highest point in each patch above a ...
0
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1answer
25 views

Fire Danger Forecast index- classification - USGS

I recently downloaded a raster image called Fire Danger Forecast index from USGS - Fire Danger Forecast, and I wanted to get the probability of fire for a set of points I have in another layer, but ...
1
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1answer
31 views

Change the reclassify method in reclassify tool in ArcGIS Pro

I'm trying to get use to ArcGIS Pro and I have tried the reclassify tool. The thing is that I know that in ArcMap there is an option to see histogram of the raster values and also choose the classify ...
1
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1answer
52 views

Conditional Reclassification using Raster Calculator

There are several questions about conditional reclassification on the Stack Exchange, but I haven't been able to find exactly what I need... In my workspace, I have a list of raster layers (8 bit ...
0
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1answer
33 views

Converting raster from LCCS to NLCD formats

We would like to convert LCCS format raster files into the US NLCD format. Is there some way for that, especially with QGIS program ? We need NLCD TIFF files for EPA AERSURFACE program. The https://...
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0answers
18 views

Reclassify a raster to floating point values range

I have an interpolation map for my NDVI data values ranging from 0.16 to 0.83. Example 4 classes, (0.16-0.28,0.29-0.36,0.37-0.53,0.54-0.83). But when I do spline interpolation classification goes from ...
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1answer
26 views

Reclassify raster values with GDAL

I would like to reclassify a raster with the following code: #RBR reclassification to USGS burn severity values arr = np.array(RBR_MultiplyBy1000_Int) level1 = (arr >= -500) & (arr <= -...
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1answer
91 views

Change nodata value from -99999 to -9999 [closed]

I read many threads here to change the nodata value of my raster to desired value - in my case from -99999 to -9999. It seems I can not use spider or anything similliar as I do not have admin rights. ...
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0answers
28 views

Reclassify not working two times

My code runs like this: arcpy.gp.RasterCalculator_sa("""Int(RoundUp("time_min"))""",path+"/Time_int") arcpy.ExcelToTable_conversion("D:/Flash Flood/Python/Reclassify.xlsx",path+"/reclassify","5") ...
2
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1answer
55 views

How to remap a raster to its min / max values in PostGIS?

I have a table of 16-bit signed (!) integer heightmaps (SRTM tiles) loaded into PostGIS. This website showed me how to export a raster as a PNG to a file: COPY (SELECT encode(ST_AsPNG(raster), ‘hex’) ...
2
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1answer
50 views

How do I reclassify raster pixels that are not intersected by a line?

I have a large raster and a line. I want to preserve the values of the pixels that are below the line, and reclassify all other pixels to NO VALUE or 9999, so that only the pixels where the line ...
2
votes
1answer
84 views

Calculate areas in ha (hectares) with gdal?

I would like to calculate using gdal certain areas in ha (hectares) for a reclassified raster. Can somebody help me with this? Here is the reclassification: #RBR reclassification to USGS burn ...
1
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1answer
51 views

Reclass raster with range input in Model Builder (QGIS)

I would like to use the QGIS model builder to preform reclassifications on several rasters. In QGIS I use r.reclass to do the reclassification by a given range (f.e.: 100 thru 150 = 1) In Model ...
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0answers
301 views

Batch reclassification in QGIS 3.10.2 produces error

I have a fairly long list of raster data that I need to reclassify. I was going through manual route but I found it too tedious to continue since I've to go through the same process if i need to ...
1
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1answer
263 views

Reclassify NDVI and count number of pixels above certain threshold in Google Earth Engine

Following on from a previous question (NDVI reclassify with mean +1SD as threshold in Google Earth Engine) I have managed to show the pixels that have value higher than NDVI mean+1SD at the estuary ...
0
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1answer
271 views

NDVI reclassify with mean +1SD as threshold in Google Earth Engine

I'm trying to do ndvi reclassify in google earth engine. I know exactly how to do it in Arcgis but I'm very new with GEE and I got stuck with javascript. What I want to do is to use mean + standard ...
0
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1answer
50 views

Create Layer of pixels with value higher than 0.3

I have code that suppose to calculte NDVI and calssify it according to the NDVI value. I have tried to add a function that will create for me a new layer that will have only pixels with value higher ...
2
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2answers
120 views

Reclass NDVI value using a function

I'm trying to reclass the values of a sentinel 2 NDVI creating a function but I don't know exactly how do to it. What I exactly want is: When NDVI values are between -1 and 0, return (-1) ; 0 and 0....
1
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1answer
75 views

Reclasifing raster with raster calculator

I am using QGIS 3.8 and I have a raster named "Ri" with one band with values ranging from 0.00299858 to 0.198849 and second raster named "IP_Q" with one band with values ranging from 0.00100708 to 14....
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0answers
27 views

Reclassify slope raster

I want to reclassify a slope raster as part of Least Cost Path Analysis, but I'm a little bit confused about the reclass rules. My rules look like this at the moment (numbers left are degree): 0 ...
2
votes
1answer
94 views

How to reclass zero values for an aspect raster layer

reclass in QGIS 3.4.11 to reclassify a raster file of aspect values. All cells reclass apart from zero values which now show as 'no data'. Text file is as follows: 0 thru 23 = 2 23 thru 68 = 2 68 ...
0
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0answers
30 views

GRASS GIS - 'cat' directory showing 0 categories for reclassified DEM?

I am trying to use an online model (Titan2D) which requires a material map (a DEM that has been reclassified so that each group can be assigned a value of constant bed friction angle once it has been ...
0
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3answers
382 views

Create new raster from both overlapping and non-overlapping values of two other rasters in R

I am having trouble figuring out the best way to create a new raster from values in two separate rasters. Some solutions involve creating stacks or bricks, others do not. Here is an example: First ...
1
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1answer
100 views

ArcPy reclassify with if statement and cell value

I have a workspace with NDVI rasters and another workspace with greyscale rasters. The rasters have the same name. I want to reclassify the NDVI raster while also using the greyscale values in a ...
1
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1answer
109 views

Arcpy reclassify with function

I have two rasters, one with NDVI values, and one with greyscale values (=(red band + green band + blue band) / 3). The rasters have the same name. I need to reclassify them in arcpy with the ...
1
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0answers
83 views

Get error using r.reclass in QGIS 3.4

I am trying to use r.reclass function on a Land Cover raster in QGIS 3.4. The operation is quite basic stuff and the settings are attached below. However, I get an error that prevents the creation of ...
1
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2answers
49 views

Reclassifying Raster Value Classes based on pre-defined function using ArcGIS Spatial Analyst?

I have this distance raster (shown in the image below). Is it possible to reclassify the distance values based on the description below- For distance values 0-100 (new value decreases linearly from ...
1
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0answers
99 views

Reclassifying string variable in ArcGIS Field Calculator with Python Parser?

I am trying to calculate a roadway pedestrian restriction based on its functional class, using if/else logic in Python. Every time I enter this, it only turns up 'No'. The categories are strings, and ...
0
votes
1answer
131 views

Change LIDAR classification of points inside polygons

I'm trying to create a pdal pipeline to adjust the classification values for all points inside polygons, but I can't seem to get it to work. The filters.range works correctly because the output file ...
1
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0answers
29 views

ArcMap cloud removal process

I am working with Landsat 8 data. I have performed the necessary pre-processes that I want (atmospheric and topographic correction and pan-sharpening, using QGIS and ERDAS). I am now working on ...
3
votes
1answer
200 views

Reclassify multiple raster files with GDAL [closed]

I have a directory containing multiple .tif files which I want to reclassify and save to a new directory. The following code already worked for a single raster. Unfortunately, I don't know how to use ...
2
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0answers
69 views

QGIS reclassify values error

I tried to use reclassify values function in QGIS. But there are always giving the following error. Does anyone know how to solve this problem? Algorithm Reclassify values starting... io_gdal 0 -...
5
votes
1answer
119 views

Error in reclassifying with ArcPy

I am trying to reclassify DEM using arcpy.sa.Reclassify and it is showing an error. Following are my commands: dem_re=arcpy.sa.Reclassify("dem_extfish.tif","VALUE",arcpy.sa.RemapRange([[391, 677, 1],...

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