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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179 views

Color map or SLD for Global Wind Atlas?

I am trying to use the Global Wind Atlas for a map about alternative energy: https://globalwindatlas.info I have downloaded the 14.5GB geotiff of global wind power density. QGIS reads it perfectly and ...
2
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1answer
57 views

PyQGIS: How to apply a color ramp on the symbol's outline when using QgsCategorizedSymbolRenderer?

I have polygon layer containing overlapping features (service areas for several years) and I want their symbology to use a color ramp in QgsCategorizedSymbolRenderer applied for each year use a ...
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1answer
83 views

Adding continuous color ramp as legend using ArcMap [duplicate]

I am interested in adding a continuous color ramp legend with numerical labels like the following example to place on the layout view of arcmap: I am quite new to arcMap so I'm not sure how I can do ...
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1answer
24 views

How to create a color ramp based on a quantitative range?

I have a set of polygons with correlation values. I would like to color each polygon based how strong their correlation value is where 0=lightest and 1=darkest. This means if I have a set of 3 ...
1
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1answer
32 views

How to combine color ramps for two different layers?

I have two layers that contains 5 polygons each with their own values. I would like to make a global color ramp that encompasses both layers. But I am not sure how I can do this. I have tried setting ...
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0answers
21 views

R nightlights color palette blue to yellow

I would like to plot nighttime light images in R using traditional NASA used color palette from blue to yellow. Does this color palette exists in any package?
0
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1answer
22 views

Convert SHD files to CLR or more modern color ramp format

I have a legacy SHD file (from Arc/Info) that contain color ramp information that I would like to use to symbolize a raster layer in ArcGIS Pro. I have access to an Arc/Info installation and am able ...
3
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0answers
76 views

GDAL ColorRamp for Float Based Values

I have a performed band calculation to calculate the NDVI grayscale. It has float based values on a single band, between 0.0 and 1.0 respectively. I am attempting to colorize the single band via ...
0
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1answer
98 views

ArcGIS Javascript 4 API - Class breaks visualization in GeoJSONLayer

I'm trying to create a data-driven visualization using a GeoJSONLayer with ArcGIS Javascript 4.14 using "esri/renderers/smartMapping/creators/color" on a field named "Number" (specifically a Class ...
1
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1answer
100 views

How can I make a heatmap of polygons using a graduated color scheme in QGIS?

I want to make a heat map of species biodiversity like the people did in the picture below. I can sort of get it to work by setting my layer with multiple polygon subclasses in the Layer styling panel ...
3
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0answers
86 views

What is tilde (~) for in R? [closed]

I know this is an almost too simple question. But maybe there is a fast answer. Looking through some code to build a leaflet map in R I found that part of code: mypal = colorNumeric( palette = "...
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0answers
14 views

Assigning “parent” color palettes in Leaflet (using R)

I'm working on creating a map using Leaflet. You'll notice in the first step, I break out each county into four different "regions". I then join it on another geo file of smaller territories within ...
4
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3answers
658 views

Apply a color ramp to vector layer using PyQGIS3?

I'm trying to apply a color ramp to a QgsGraduatedSymbolRenderer in PyQGIS 3 (QGIS 3.8) using the following code: Getting the QgsGradientColorRamp: myStyle = QgsStyle().defaultStyle() ...
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2answers
123 views

Apply external choropleths in QGIS 3

I have a large number of cloropeths stored in SLD and QML formats. QGis is unable to apply any of those, there is no option in the GUI for SLD, whereas it fails to apply QML files correctly. Is there ...
3
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2answers
350 views

QGIS Time manager Changing Color Polygon

I'm using QGIS 3.6.3. Noosa. I have 10 polygons, each has a starting time and an end time. Getting Time Manager to run was no problem at all. However, there are two things I would like to add in my ...
2
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0answers
125 views

Discrete color ramp in QGIS

This seems basic but I am new to QGIS and I can't find how to do it. I have three shape files each with the same attribute. Each shape file is imported into its own layer. Each shape file has ...
1
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1answer
45 views

Proper way to share raster layer

In ArcGIS I have used to share a shapefile (for example beach areas) by sending a package that contains different files (.shp, .shx, .prj, .cpg, .dbf, .sbn, .xml) which contains all necessary ...
3
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6answers
676 views

Rule based coloured background for labeling in QGIS

I am a newbie working on QGIS 3.6 / Windows 10. I need to label a polygon layer which is categorised by colour. (pls refer to attached pic as a graphical reference) The labels need to have a ...
2
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1answer
431 views

Making colored hillshade in QGIS?

Today I found that ArcGis can make colored hillshade like on piture below. Here is link to their blog. I want to do that in QGIS. I know about layer coloring feature, and it's close for perfect, but ...
1
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0answers
58 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 ...
1
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1answer
209 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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0answers
139 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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0answers
91 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 ...
4
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1answer
203 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 ...
3
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2answers
311 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 ...
0
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1answer
290 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, ...
10
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1answer
571 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 ...
0
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2answers
95 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 ...
1
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2answers
407 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 ...
2
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1answer
276 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.
3
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1answer
343 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
119 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 ...
1
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1answer
397 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 ...
2
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2answers
255 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 (...
0
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1answer
885 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 ...
0
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0answers
34 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 ...
0
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2answers
70 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 ...
7
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2answers
933 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 ...
5
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2answers
394 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 ...
3
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1answer
1k 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 ...
1
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1answer
400 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 ...
2
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0answers
345 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 ...
1
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1answer
370 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 ...
3
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0answers
305 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 ...
4
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0answers
861 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
945 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 ...
2
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2answers
371 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
608 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 ...
3
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2answers
428 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
101 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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