Geographic Information Systems

Questions tagged [color-ramp]

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A range of colors used to show ranking or order among classes on a map.

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49 views

Setting color assignment order with ArcPy?

I have a shapefile feature class with the following attribute table: I set the shapefile symbology using these lines: lyr.symbology.valueField = "GRIDCODE" lyr.symbology.addAllValues() What i get ...
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1answer
53 views

Apply color ramp to (QgsSingleSymbolRenderer) Simple marker

I'm using a QgsSingleSymbolRenderer to display various points and lines etc for a Line geometry. I have a Single symbol symbology to display the last vertex as a: Line > Marker line > Marker &...
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21 views

Making color text file using GDAL?

I have an 8-bit greyscale image that I want to convert to a "heat map" based on data values (0-255), using a color ramp. I'm aware that gdaldem works with color-relief, so I used the following steps ...
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33 views

GeoServer: colormap for point data

How could I create a continuous colormap for point data in GeoServer? I am planning to serve satellite measurements (METOP IASI) as point data in GeoServer 2.15 and want the point colors to represent ...
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20 views

Normalizing Elevation data in ArcGIS Desktop?

I went to do a natural break scale on elevation data for a few long distance hiking trails. The problem is there was just to much data for ArcGIS Desktop to analyze. The sample it came up with was ...
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1answer
45 views

Forcing color ramps to center around zero in QGIS

I have several columns of data that have percentage values. Some are positive and some are negative. In one particular column, the values range from -0.70 to +0.20. The mean value of the column is ...
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2answers
167 views

Adjacent DEM color matching in QGIS?

I have four 15 arc second resolutions DEM files (15-C.tif, 15-D.tif, 15-I.tif, 15-J.tif) downloaded from viewfinderpanoramas.org. When I input them in QGIS I noticed that the 15-J.tif layer differs a ...
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1answer
48 views

User-Scaled Color Relief Map to Google Earth from DTM

I have a DTM file, and my goal is to load it up onto Google Earth as a color relief map, with the colors gradient at levels I chose. I have successfully done this with RAS MAP using HEC RAS software, ...
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1answer
123 views

Apply a different color ramp to subset of categorized symbols in QGIS?

The goal is applying a color gradient to a subset of symbols, instead of applying it to all the existing symbols. I used to do this in ArcMap. In QGIS I have to do it manually, and it's very time ...
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26 views

2-color color ramp in QGIS [duplicate]

I'm working with QGIS Desktop 3.4.4. I want to use a color ramp in order to have several gradual color classes with the positive numbers going more red and the negative numbers going more blue like on ...
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2answers
51 views

Displaying rainbow colors for multiple polygon layers in ArcMap?

I am working with ArcMap and I have a series (20) layers - polygon lines in a group. I would like to ask you a way to color (not manually) all the lines with a rainbow color palette. The lines are map ...
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2answers
127 views

Calculate 16-bit elevation values from a 32-bit RGBA image?

Say a single-band 16-bit (UInt) raster with values representing elevation (meters) must be converted to a 32-bit RGBA PNG image (8-bits/band) for use in a web application. The image dimensions must be ...
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1answer
130 views

How to delete custom color ramp in QGIS?

I have customized a new color ramp in qgis. Now I want to delete that. I could not find any way to delete this.
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1answer
124 views

Force a minimum value in a color ramp classes in QGIS 3.4.1

I am trying to apply a color ramp to a shape using percentage values where red would be low and green would be high. The data ranges from 74% to 100%, but I need the minimum value to be 0%, so that ...
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0answers
49 views

Transfering color style from one raster to other rasters using QGIS?

I have a raster set and I need to classify them using the "pseudo color singleband" with "RdYlGn". What I'm trying to do is classify a raster and copy the style to the others, but it does not work ...
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1answer
162 views

QGIS: where are custom color ramps stored?

Using QGIS 3.4.0, I have created a new custom color ramp, using: Settings > Style Manager > Color ramp > green plus sign I saved the new color ramp as follows: The color ramp works just fine. Out ...
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2answers
97 views

Heatmap-no data vs Zero

I am new to QGIS. I am working on creating heat map of bird diversity(data downloaded from ebird.org). The issue I face is that how to differentiate between: There areas where data is not available (...
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1answer
369 views

Changing color scale in KML files?

I want to work with kml/kmz files in the Google Maps API, but I want to remap the color scales. Is that possible? Here are example kml/kmz files where I'd like to change the color representation ...
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28 views

v.surf.idw raster file conversion into a vector with same colours style

Is it possible to convert from raster to vector the raster file resulting from grass interpolation algorithm "v.surf.idw" coloured with the quantile method and maintain such colours in the vector file ...
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2answers
44 views

Making colours proportional to value field, continuously and not discretely as with graduated colours classification in ArcGIS Desktop?

Under symbology in ArcGIS, there's the option to graduate colours given a value field, a colour ramp, and some classification. How do you make the colour graduation continuous (rather than discrete ...
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2answers
345 views

Creating new QGIS color ramp from r,g,b text file?

I am using QGIS 2.18.22 I would like to create the Cividis color ramp in QGIS. Here's a (non-cartographic) display example of Cividis: Source Cividis' creators have made public a 256-line r,g,b ...
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2answers
364 views

Creating graduated point circles in ArcGIS Desktop?

I have not been giving any data, but I have been told that I could be expected to recreate maps In ArcGIS 10. Below is an sample portion of what I may have to recreate. I have no idea how to get ...
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1answer
661 views

Downloading image/exporting image to google drive from google earth engine with color palette

When I download Analysis results from Google Earth Engine, the image is exported in to google drive but it does not have a color palette. How do i add color palette with the exported image using earth ...
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50 views

Set Color Ramp of Raster using Arcpy

I have a script which creates multiple Raster layers (sometimes more than 100). By default, these are created with the gray-scale color ramp, which for the purposes of my users is almost worthless. A ...
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1answer
233 views

QGIS Color Ramp Apply

I have almost 100 of single band grayscale rasters. Importing all of them one by one to QGIS and changing the color ramp seems laborious. Is there any PyQgis codes/function that can apply predefined ...
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0answers
166 views

Applying Color Ramp in PyQGIS?

I extensively use ArcPy, recently needed to apply a specific color ramp on a single band raster and export it. Arcpy does not allow me to apply color ramp and save the raster with the applied color ...
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1answer
173 views

Polygon layer symbology not displaying correctly in QGIS 3

I have a polygon layer with multiple attributes. I want to display a color ramp for one of those fields (which is a "real" number field calculated using 2 of the other fields). The problem is, when ...
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0answers
189 views

QGIS 3 heatmap, on screen color ramp with data scale

When making heatmaps in qgis 3.0.1 i would like to place the color ramp with percentage and actual numbers for the bin borders on the map. Each marker under the color ramp represent a percentage of ...
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0answers
482 views

Add color palette to grey-scale land cover GeoTIFF

I have a single band grey shade tiff image which does not have a a color palette associated with it. I need to open up the symbology and assign a color to each unique landcover class. I am looking ...
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2answers
373 views

Why North direction is shown in red color on aspect maps?

I have been recently exposed to an aspect map that looked like this: I wonder why North-y orientations (N, NE, NW) are shown in red and orange while South-y orientations (S, SE, SW) are shown in ...
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0answers
178 views

Making CIR imagery in QGIS

I want to compose a CIR image in QGIS. Images are part of sample dataset downloaded from Micasense website. I built virtual raster out of Red, Green and NIR rasters but the output file color scheme ...
4
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1answer
274 views

Resolve why R is not using the full colour ramp in the package tmap

I am creating a map using tmap with a quantitative variable that I wish to use for setting the polygon colours. When I set the colour ramp using a standard RColorBrewer palette or with a custom vector ...
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2answers
343 views

Preset Color Ramp in ArcGIS Desktop?

I am trying to make a custom color ramp by using preset color ramp in ArcGIS 10.5. I need to show 19 colors. The default number of colors that can be input in preset color ramp is 13. Is there any ...
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0answers
84 views

pyqgis custom color ramp raster dataset

I want to create a custom raster color ramp using pyqgis in a standalone app. I have found some examples about this task, for example: s=QgsRasterShader() c=QgsColorRampShader() c.setColorRampType(...
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3answers
359 views

Save an edited color ramp as a new color ramp in QGIS 2.18

Is there a way to save an edited, pre-existing color ramp as a new color ramp, or export the edited color ramp in QGIS 2.18.xx? I'm able to take an existing gradient ramp, say, "Blues", and edit it, ...
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2answers
93 views

Symbology forMultiple Attributes in ArcMap?

I need some help to map landslide proximity to urban areas and their size on ArcMap 10.5.1. I am unsuccessfully trying to use symbology by multiple attributes. The data is point data but within the ...
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2answers
261 views

How to export raster file with a known color ramp?

I have a single band raster file( that it is Grayscale) and I changed its symbology to unique value with a Known color ramp. How can I save this raster file with its color ramp (to .tiff) so that it ...
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0answers
79 views

How to Center a Split Colour Ramp on Zero in Arcgis?

I have a number of different rasters with different ranges. I want to display them with defined intervals of 10. Values range from -200 to 400 varying for each raster. I want to symbolize them with ...
4
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1answer
114 views

Apply color ramp to marker outline

I have a point layer in QGIS 2.18.14. I have colored the points based on a category, using the YlOrRd color ramp. Now I am trying to change the outline of each point marker to be slightly darker than ...
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0answers
249 views

Sharing custom made color ramps in ArcGIS Desktop?

I've successfully created a custom color ramp in ArcMap (v. 10.3). From the Style Manager I can see the path to where my custom color ramp is located, but I'm unable to locate that path on my machine; ...
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1answer
163 views

Understanding symbology in IDW interpolation using QGIS 2.18

Continuously to Understand ramp color interpolation using QGIS 2.12, I used IDW interpolation on those height point without inserting the real values (minimum value is 8 meters, maximum value is 584 ...
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3answers
530 views

Creating 4 part color ramp in ArcMap?

I am using ArcMap 10.4.1. I am trying to create a custom color ramp that only has 4 colors, as defined by the company I work for. I am trying to create the color ramp through the Style Manager but the ...
5
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1answer
141 views

Consistent layer colors that are automatically adjusted based on adjacent polygons?

I have several polygon layers and I want to set 4 colors to fill all of those, but the color of one layer should not be the same with the adjacent polygon. I have read several questions about ...
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0answers
112 views

Rendering using color ramp for negative value in PyQGIS

I'll try to rendering single band raster (GEBCO bathymetry) by using PyQGIS.. This is my script so far bathymetry_file = "E:/byth_gebco.tif" layer_bathymetry = QgsRasterLayer(bathymetry_file, '...
7
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1answer
357 views

Circular color map in QGIS

In order to plot azimuth values for example, does anyone know any good circular color map? By good I mean, visually suited for human color perception. I didn't find any suited color ramp preset in ...
2
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1answer
99 views

Classify area by year

I'm trying to classify a set of buildings (grey) in a layer, according to construction year, in a number of different areas (orange). In Orange – areas with a sum of buildings inside. The ...
7
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1answer
4k views

How to assign colors to specific raster values using R

I am using the levelplot function of the awesome rasterVis package to create a map whose values diverge around zero. I am plotting a raster file using a red to blue palette, but I am trying to assign ...
4
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2answers
1k views

Defining a color ramp for temperature range & applying it to different rasters?

I'm using QGIS 2.18 (Las Palmas). I have downloaded Climate-Data from WorldClim and I would like to display all of the monthly maps within the same color scale (and I don't mean within Styles always ...
1
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1answer
512 views

Custom matplotlib discrete colormap with fixed values on raster

I've been using a color ramp with fixed values (0-255) corresponding to specific rgb color (discrete interpolation) for 8bit tifs in QGIS. I've used matplotlib to apply built in colormaps, but I'm ...
6
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2answers
223 views

Heatmap of sold homes with constant cell size?

QGIS version 2.18.5 I'm working with annual house prices in England and Wales with excel columns as: A; Transfer Price B; Postcode C; Lat D; Long. There is approx 400,000 rows of data for 2011. I'm ...

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