The property possessed by an object of producing different sensations on the eye as a result of the way it reflects or emits light

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4
votes
1answer
37 views

How to create a map colored by distance to nearest point in R

I'm new to GIS and R-- hope this question makes sense. I have a dataframe(geo07) containing two variables that record the long/lat values for about 6000 points (mat_long & mat_lat). These ...
1
vote
1answer
35 views

Coloring polygon based on date using TileMill/CartoDB?

How would you color a polygon/line/dot based on a date? The colors would be a pre-set list. I need the area to update its color based on the current (or given) date. I would be using tilemill or ...
0
votes
1answer
276 views

Polygon color on intersect

Using OpenLayers, I am loading a large geojason file of about 4000 polygons. Once the polygons are loaded I want to draw a "LineString" on the map (already done and working). My challenge is that I ...
1
vote
0answers
34 views

Inverting color ramp in legend

I have inverted the color ramp to display land surface elevation, now when I add a legend in print composer it shows the lowest value at the top and the highest at the bottom. See below: It is more ...
2
votes
2answers
66 views

How to match colours in already mosaiced single image?

I have an already mosaiced image for a large area. I need to match colours in this single image. I do not have each image separately. I just have this large single image downloaded from GLS. How can I ...
0
votes
1answer
52 views

qgis's georeferencer renders my white map with a translucent blue tint, can I prevent this?

I'm running QGIS 2.0.1-Dufour on MacOSX and when loading a PNG or TIFF into qgis as a raster its always getting rendered with a blue tint. Here's what it looks like before being loaded into QGis's ...
2
votes
0answers
54 views

Can I export the RGB values from an ArcGIS layer symbology?

I've got a point layer in ArcGIS that has 100 specific color codes based on the name of the store. I'm trying to export the RGB values for these colors (along with the name value it's tied to) so I ...
1
vote
0answers
22 views

How to change color of points dynamically from a geoJson in openlayers

I am new in Openlayers and what I am trying to do is to dynamical give a color to some points read by a GeoJSON file. I am taking inspiration by this post How can I add an infowindow to an ...
3
votes
1answer
30 views

How to change the color of vector layer of QGIS in api?

I'm using QGIS-2.4.0 api to develop app in C++. When I add a vector layer to the app, the vector map's color would be random. I used QgsFeatureRendererV2 to get the geometry type of the layer, my ...
4
votes
5answers
1k views

How to pansharpen LANDSAT 8 in GRASS?

Having used QGIS for quite some time for mapping, I was 'forced' to dig into GRASS as pansharpening is not directly executable in QGIS. After understanding more or less the structure, I did some ...
5
votes
1answer
104 views

Why do CMYK colours in ArcMap not match those in Adobe products?

I'm creating a map in ArcMap, based on a style guide which specifies colours in CMYK notation. So I've set the colours in ArcMap's color selector. The layer has no transparency set, and is the only ...
1
vote
1answer
48 views

A nice display of hillshade and my geologic map

i want to create a nice hillshade map covered by a grid or RGB map, with similar colour results in ArcMap like this: Is there a way to achieve this in ArcGis without transparency settings which ...
21
votes
6answers
8k views

What is the best colour-ramp to use for elevation?

This is maybe rather subjective as it concerns style, but I would like to have a few decent colour ramps for my DEM when it is layed over my hill-shading. I have created the Swiss hillshade model as ...
1
vote
0answers
32 views

Postgis Raster Unions Color Issues

Can someone explain to me what I am doing wrong here as I think I do not properly understand postgis raster bands. I have a set of geometries that I want to merge with a raster and created a raster ...
1
vote
1answer
125 views

Different colours for touching lines on MapInfo?

I am creating maps for surveyors showing different sections of roads. The start and end points need to be clearly visible so I am using a Region IndValue thematic map. However, sometimes when an ...
1
vote
0answers
37 views

Legend won't print in color [closed]

I am using ArcMap 10.1 and my legend will not print in color. Please help. I have a layer with points and symbols that show up in color on the map but not in the legend, what should I do?
1
vote
0answers
16 views

Vector Layer Symbol (ism) properties?

I would like to streamline the render of a polygon grid vector layer as a simple line (no fill) via Python coding. I am I bit confused by the implementation referenced by the API. Is it possible to ...
2
votes
0answers
135 views

Adding colours from .style file to multiple shapefiles via script? [closed]

I have added 70 fill colours in a .style file. For adding these colours to my shapefile i would have to manually go to properties/symbology/match to symbols in a style/ then browse to the location ...
1
vote
1answer
147 views

SetColorInterpretation() for a GeoTiff using GDAL not working

I have a single band image which I would like to copy to a 3 bands of a new image and set the ColorInterpretation to red, green and blue respectively. I have tried two approaches, one using the GTiff ...
1
vote
0answers
88 views

Color different in Maps exported from ArcMap to PDF and other formats?

When exporting the same map in ArcMap into different formats the color is not consistent. The map is a roadway network and I use grey 30% solid line as the symbol in ArcMap. However, when i export ...
1
vote
2answers
157 views

In ArcMap 10.2, exporting raster as .tif with “use renderer” and “force RGB” still produces inaccurate colors

I have a DEM and my aim is to change its color ramp using ArcMap, then export this colored raster as a geotiff (8 bit). I checked "use renderer" and "force RGB" options but the results are not good ...
1
vote
1answer
109 views

Worsened image quality and false colours after georeferencing

When I georeference a map of vegetation types (about 20 colours, each representing a certain vegetation) the quality of the georeferenced map is really bad and some colours have changed (e.g. black ...
0
votes
1answer
100 views

How to convert excel csv file to filled contour Google Earth Map?

I have a csv file http://www.geocities.ws/radar/data2.csv. The first column is latitude. The second column is lonitude. The third column is precipitation type. 5 represents freezing rain. 15 ...
1
vote
2answers
89 views

Retrieve Elevation from Color in Raster DEM

This might turn out to be a newbie question, and that would be because I'm fairly new to GIS work, but extensive online searching, asking associates with some basic GIS knowledge and hours in various ...
15
votes
1answer
273 views

Eye-friendly colours for long periods of work

Apologies if this question doesn't fit the rules here. I am digitising a large amount of remote footways and I will be panning, zooming a lot and I've done 2 days on this so far and always get quite ...
4
votes
4answers
1k views

Halo use background color

As you see on the attached image, I labeled contour lines on the map (in meter). Which function will allow the "halo" to take the background color of the map? On the image, the halo is greenish which ...
0
votes
0answers
47 views

Problem – QGIS 2.2 - Values under Color Rendering saved in style not applied when applying the loaded style?

I have saved two variants of the same color-scheme by putting in different values under “color rendering” in the lower part of the screen. It’s a singleband pseudocolor scheme. Now when I load each ...
0
votes
2answers
123 views

Color gradient in symbology in ArcGIS 10.1 for interpolation raster

I have measured noise and want to create with this measured points a noise map with interpolation....is there any way in symbology to create a flowing transition between the different colors for the ...
1
vote
1answer
382 views

List of Offensive Symbols/ Colours for Cartography

I was at a data visualization workshop a few days ago and someone there asked if there are any symbols/colours that might offend people when making charts, the presenter didn't really understand the ...
0
votes
1answer
154 views

Automatic four-colour (political boundary) rendering with PostGIS

This is probably a long shot, but is there a way to automatically select colours for neighbouring regions using the four colour theorem, in PostGIS? The data I'm using is suburb boundaries in ...
8
votes
3answers
574 views

How to apply the four colors theorem in a polygon map in ArcGIS/ArcToolBox automatcally?

I need to apply the four colors theorem in a polygonal shape in a way that I do not need to choose manually each color to put in each region. I wish to knows if there is any extension, plug-in, script ...
1
vote
0answers
90 views

PyQGIS: How to color raster layer with existing colorBrewerMap

With pyqgis I have added multiple new raster layers to the legendinterface(). Because i like the ColorBrewer style i want to color some of them with the "Spectral" gradient. How can I do this in ...
2
votes
2answers
120 views

Is there any systematic way to pick two colors for a chloropleth showing a candidate's margin of victory

I have a simple 2-color map showing which candidates won in which precinct. Now I want to make one showing margin of victory within a precinct. So if candidate A won by a lot it would be dark green, ...
-2
votes
1answer
91 views

How to Insert color code to ArcMap? [closed]

I have a color code from OpenStreetMap and I want to insert this code of color to Arcmap, How?
1
vote
0answers
85 views

How to optimize color ramp for terrain

I'm working on a project to highlight LiDAR terrain on the web and part of the idea is to show the detail of the data at large scales. I've already read through the excellent Mapbox guide and I've got ...
0
votes
2answers
79 views

What output colour format is expected by the QGIS data defined properties widget?

I'm trying to write a python function that takes a BGSREF attribute from a BGS geology shapefile and uses it to colour up the geology polygons of a shapefile. I posted my non-code working as a part ...
1
vote
1answer
49 views

GEOTIFF Binary File with Color Display Issues

I have a GEOTIFF in QGIS that shows values of 0 and 1 and I want the 0 values to have no fill so that background vector layers can show through and so I can easily overlay things in a print composer ...
3
votes
3answers
465 views

How to color-code geology maps with given CMYK colors?

I'm trying to understand whether it is possible to corectly display colours in British Geological Survey maps. Our client has a licence to use the shapefiles but unfortunately BGS don't provide SDL ...
2
votes
2answers
182 views

Convert ASCII Grid Colorized to Raster

I have an ASCII Grid file + .prj file and can visualize this in qGIS. I can colorize it by going to properties and using a Pseudocolor Ramp. However, I want to export this now as a TIFF / Raster. ...
0
votes
0answers
21 views

IColor reporting BGR rather than RGB

I've created a single point in ArcMap 10.1 SP1, and set it's color (SimpleMarkerSymbol) to Red = 16, Green = 0, and Blue = 255, or 1000FF in hex. I saved that as a layer package, and opened it back ...
9
votes
2answers
258 views

Is there a method to have the colour of a label automatically match the colour of the polygon indicated in the symbology tab?

My job requires that I produce several print maps every day, for a variety of different users. It is usually pretty straight-forward, but sometimes I have to make a map that uses rather ...
0
votes
0answers
45 views

How to get the color of a vector layer in pyQGIS?

I have see this topic (How to change the color of a vector layer in pyQGIS?) but I'm looking for get the color not to change. How I can resolve my problem ? Thanks
2
votes
2answers
285 views

How to add an image to an existing data frame using Python?

This is the first time I am using Python on my own, and I have searched for this answer for a few hours with no luck. I am wanting to take a .JPG image and put it in a data frame. The image has to ...
0
votes
1answer
63 views

How to change QGIS project color space

Is it possible to change the color model of an entire QGIS project from RGB to CYMK? I know that it's possible to change the color models of individual symbols/features (through the style manager), ...
1
vote
1answer
103 views

How to convert a multi-band landsat RGB to a kml file using MAPTILER

I was able to use maptiler for converting a single raster (ortofoto geotiff obtained with UAV) into a kml file. Now I want to convert a RGB landsat into kml for visualisation in Google Earth. It is ...
5
votes
1answer
226 views

How to convert ArcMap color ramps to QGIS?

I have both ArcGIS 10.0 and QGIS 2.0 How can I reproduce a specific ArcGIS color ramp in QGIS? If possible, I would like to simply convert the Esri *.style file but perhaps there is another ...
9
votes
7answers
914 views

How to automatically set polygons borders to improve map readability when rendering thematic maps?

When mapping an value as a color to render a thematic map the objects borders can alter the map readability a lot. For example in this thematic map of the US counties with black borders: There are a ...
0
votes
0answers
43 views

Tool to save own color table with CMYK, GRB and HSL

Im looking for a tool to save my colors with CMYK, RGB and HSL. So that I can print and compare, write some notes to every color and easy extract. Any idea? Im mainly using Inkscape, Gimp and QGIS ...
0
votes
1answer
74 views

Graduated colouring Voronoi polygons? (QGis)

I've got a huge database of depth points for the whole Irish sea which I'd like to be a nice smooth surface, or at least have a depth value associated with the entire area (i.e. include the ...
2
votes
2answers
187 views

How to programmatically change raster symbology after reclassification?

I have created a code in Python that I will use for a custom tool in ArcGIS, the code will create a Eucledian Distance of 6000m around a point and Reclassify the distance from 0-2000, 2000-4000, ...