Questions tagged [stretch]

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1answer
70 views

Changing min max of Stretched Raster with ArcPy?

I have two rasters r1 & r2: Maximum cell value of r1: 0.9 Maximum cell value of r2: 0.3 Minimum value for both is 0 I am using a color gradient: white - yellow - green - blue - red - black ...
3
votes
1answer
130 views

Multi-band raster color model in QGIS. Why RGB (668, 983, 1007) in Uint16 appears green?

I created an RGB Uint16 composite raster in QGIS . These are band designations: Band 1 - blue Band 2 - green Band 3 - red When i query value of a pixel that appears green - it shows (B3: 668, B2: ...
1
vote
0answers
80 views

Changing “Stretch Type” of list of rasters to “Histogram Equalize” with ArcPy?

Goal: To modify a list of rasters using the histogram-equalize stretch-type What is the appropriate tool to use to change the stretch type of a list of rasters to histogram equalize with arcpy? ...
3
votes
2answers
732 views

How to automatically stretch raster in QGIS? (ArcGIS DRA dynamic range adjustment analogue)

I am looking for ArcGIS's dynamic range adjustment (DRA) analouge in QGIS for raster data sets. And I have found such button: But I have to click it every time I move raster's extent. There is any ...
0
votes
0answers
264 views

Stretching (rescaling) Raster (NDVI) Values between -1 and 1?

I am trying to equalize NDVI values for the same area temporally. For example 2014 LS8 NDVI values between -.12 and .007 while 2011 LS5 values between -.33 and.77. I would like to equalize each raster ...
0
votes
1answer
152 views

Raster stretching on ImageMosaic with Geoserver

I am trying to demo serving rasters over GeoServer. I have created the store and the layer but the layer preview comes up all black. The layer is queryable however so I know the data is accurate ...
-1
votes
1answer
40 views

Changing default raster save settings in ArcMap?

I am clipping and saving an IMG file (created in ERDAS Imagine's MosaicPro tool) using a model in ArcCatalog 10.4. When displayed in ArcCatalog or when opened in Arc 10.4 its symbology is set to "...
1
vote
2answers
1k views

How to extract values from a raster using R?

I'm a beginner at using R software, and I'm attempting to perform a percent linear stretch on the following raster data: > KBnew #class: RasterLayer #dimensions : 27018, 26389, 712978002 (nrow,...
5
votes
1answer
372 views

QGIS Georeferencer is stretching image

I'm trying to Georeference an image. I've followed the guide from QGIS, but for some reason, it's stretching, and offsetting the image from the points. For example, my input of the southwest corner ...
1
vote
1answer
2k views

How to rescale data ranges in ERDAS?

I have an Normalized Difference Vegetation Index(NDVI) and Enhanced vegetation index (EVI) layer and I want to re-scale their data ranges to value ranges from 0–to–1, in order to optimally stretch the ...
2
votes
1answer
693 views

Updating contrast enhancements for raster layers using bandStatistics in PyQGIS?

Found this function to update statistics for a raster layer : rlayer.setContrastEnhancement(QgsContrastEnhancement.StretchToMinimumMaximum, QgsRaster....
3
votes
1answer
367 views

Export Stretch Function values - Arcpy

I'm looking for a way to export Stretch Function values from images that’s stored in a Mosaic dataset. Not values from the whole set, but specific stretch functions per image. The set is stored in ...
3
votes
2answers
887 views

Raster standard deviation stretch Python script

I am looking for ways of applying a permanent standard deviation stretch to rasters via a Python script. Are there any ArcPy raster stretch functions? I was looking for a reference but could not find ...