The set of conventions, rules, or encoding systems that define how geographic features are represented with symbols on a map.

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33
votes
5answers
7k views

Curved point-to-point “route maps”

I have recently been looking at airlines web pages that display their routes departing a certain city to all other cities they service. I would like to be able to create similar curved routes between ...
5
votes
5answers
6k views

How to vary the transparency of symbols within a single layer in ArcMap?

I have a polygon layer which I am drawing in ArcMap using a graduated color symbology: Is it possible to vary the transparency between the classes, so that the transparency tapers off with the ...
5
votes
5answers
18k views

Changing Symbology of Multiple Layers using ArcMap/ArcPy?

Is there a way to change symbology for multiple layers in ArcMap or ArcCatalog. I want to change the symbology of multiple layers at once.
24
votes
5answers
3k views

Are there any international standards for map symbology?

We are going to let our users add points, polylines and polygons to a map. Are there any international standards for map symbology? For example for emergency symbols?
16
votes
3answers
5k views

Using ArcPy to get layer symbology?

Since ArcGIS 10 comes with ArcPy package, i'm wondering it is possible to use ArcPy functions to get Symbology (i.e color, width...) of a layer?
15
votes
4answers
25k views

Is there a SVG symbol library for qgis?

Im currently using default simple symbol capabilities or dingbat fonts for point objects. Is there maybe a SVG symbol library for qgis that is a bit more extensive than that which is included? I've ...
6
votes
2answers
1k views

How to symbolize features with NULL values in graduated symbology?

I have a polygon feature dataset, and an attribute from a different table that I join (one-to-one) within QGIS in order to symbolise the attributes as a choropleth map. However, not all polygon fields ...
5
votes
2answers
7k views

Change Symbology of layers from within ArcMap

In an active ArcMap session - I want to change the symbology of a layer which is repeated multiple times in the mxd. Can I do this? The basic code I have for getting the layers is below. This is ...
9
votes
1answer
444 views

Adding labels with symbols to legend in ArcMap?

I'm creating a map with ArcGIS Desktop v10.2.2, showing museums as points. The museums layer has no symbol and the labels are made of a circle filled with color with the ID inside, taken from the [ID] ...
6
votes
1answer
2k views

How to create a style file for QGIS from a plain text file?

Using QGIS 1.7. I have a plain text file, which lists 115 rgb values against a map code for a geological map. Viz.: $ head gsv1Msymbology.txt MAPCODE RED GREEN BLUE Oc 143 255 255 WAT 255 255 255 ...
3
votes
1answer
691 views

Downloading ArcGIS Online symbology to ArcGIS for Desktop?

I would like to transfer the symbology from my ArcGIS online maps to desktop. Each time I download it reverts to default. Does anyone know of a way to do this, or perhaps there is a symbology package ...
2
votes
1answer
444 views

QGIS just installed on MAC OSX - vector layer styles do not work properly

I am a newbie with QGIS - I have just installed QGIS 2.10.1-Pisa. I am following a youtube tutorial by Steven Bernard and I just found that the styles do not work properly (I run Mac OS X Lion 7.5.1. ...
3
votes
3answers
566 views

How do I plot points as graduated/proportional circles in R?

I'm back again with more R mapping questions! This one is concerning symbolizing points by a certain attribute with graduated/proportional circles. DATA: My full code can be found here if you're ...
3
votes
1answer
1k views

How to add complex Emergency Symbology (TrueType fonts) to QGIS?

In other packages I would simply ensure the TrueType font (+.ttf) was loaded on the operating system and it would be available for use. QGIS seems to rely on making your own. The symbols I wish to ...
7
votes
2answers
510 views

How to display nebulous boundaries between regions with indistinct edges?

I'm trying to map the boundaries between regions which don't necessarily have a hard edge. For example, areas where languages predominate don't have a distinct edge, but instead have a degree of ...
7
votes
8answers
9k views

Manually classifying graduated data outside of range in ArcGIS for Desktop?

I have two shapefiles representing grids with values that are symbolized with graduated colors, shown below: You can see that the two shapefiles encompass similar ranges of data, but assign ...
6
votes
3answers
3k views

Is there ArcGIS Symbol Library PDF for ArcGIS Desktop i.e. index for symbols/line weights?

ESRI has an old set of PDFs from 2004 showing all the symbols available in ArcGIS at the time and their names. I don't need it often but if I'm searching for a certain symbol and don't know its name ...
5
votes
2answers
287 views

Which true type editor do you use to create/modify point symbols for GIS?

Which true type editor do you use to create/modify point symbols for GIS and what are the advantages and disadvantages of the tool? I am looking for a true type editor to create/modify custom point ...
4
votes
5answers
8k views

How can I symbolize a layer with graduated colors by a date/time field?

I've got a layer of polygons where each has a date associated with it. I want to color the polygons with graduated colors, but I want the colors to start with the newest polygons and fade to the ...
5
votes
2answers
669 views

Auto-updating symbology between *.mxds for same shapefile using arcgisscripting?

I have a variety of .mxds for any one project I'm working on, which are all different but all use the same set of base shapefiles for my project. I know I can save a .lyr version of my initial ...
5
votes
2answers
8k views

Directional Flow Arrows for sewer lines

I am working for the Town of Yadkinville, NC and would like to know how to create a layer of directional flow arrows for sewer lines to be able to turn them on and off at will?
4
votes
1answer
414 views

How to horizontally align irregularly shaped point symbol to vector layer in QGIS?

Fairly new to QGIS and searching a method to graphically align my point symbols in the direction of the vector. The symbol represents a water valve in an irregular shape in close proximity to a vector ...
2
votes
1answer
418 views

Showing directional line symbol in ArcGIS for Desktop?

Is this possible in ArcGIS to have variable number of arrows on the line to show direction? This is an ArcGIS example, where I can have fixed (1,2,3,4,5...) number of arrows and it stays the same ...
1
vote
1answer
3k views

How to create symbol with size and color based on two variables in ArcMap?

In arcmap 10.2 i have a layer that has two attributes: depth and magnitude. Depth should be represented by color: deeper points being lighter and shallower being darker. Magnitude represented by ...
1
vote
3answers
354 views

Symbolizing multiple polygons as one by dropping internal boundaries?

Using ArcMap (ArcGIS 10.2 for Desktop), is there a way to symbolize two features within the same feature class as one feature without editing the feature and merging them? For example, if I have a ...
1
vote
1answer
1k views

Changing color of symbol in UniqueValuesSymbology object using ArcPy?

I have an template mxd I reference with several pre-defined layers. The only variable I need to modify is the color of certain symbols in the layer. I have tried to modify and dig around the Symbology ...
12
votes
1answer
3k views

How to create desire lines in QGIS?

How can I show the flow coming from an Origin-Destination matrix as desire lines? I need a result like the one in the picture below. I need to scale them proportionally to its value (coming from a ...
25
votes
5answers
3k views

Coloring thousands of polygons so each is distinct from its neighbors?

I am using ArcGIS 10, and I have layers of the 2010 Census blocks, block groups, and tracts. There are thousands of polygons in these layers. I want to color them so that each is distinct from its ...
12
votes
3answers
1k views

Crime mapping symbology

Are there any standard, publicly available symbol sets for crime mapping? What are their intended applications and their strengths and weaknesses?
7
votes
6answers
7k views

How do I cluster XY point data? (ArcGIS 9.3)

I have a whole bunch of icons displaying on a map, I want these clustered together as was suggested to me for a different question here... ArcGIS 9.3. How do I increase Picture Marker Symbol ...
7
votes
2answers
3k views

How to use a field-to-RGB mapping for symbology in QGIS?

Using QGIS version 1.7. I have a plain text file that lists a set of rgb values against a code. I want to use this colour table to colour a polygon layer by mapping one of its attribute fields ('...
3
votes
1answer
123 views

Forcing QGIS to remove polygon borders?

I have a GML layer representing an hexagonal grid that I would like to include in some maps. In QGIS (version 2.14.2) I applied a graduated style and completely removed the polygon border: However, ...
6
votes
3answers
2k views

How to normalize choropleth maps of census information?

I'm trying to improve on the census-based maps on this site, which shows census values at 5 scales from Collection Districts through to State. Currently the maps show whole numbers (eg total ...
4
votes
1answer
326 views

How to change the number of decimal digits in arcmap in symbology

I'm using ArcMap 10.3. In symbology, there are 6 decimal digits for the different classes of the variable I'm presenting. I'd like to show only 3 decimal digits. I can edit the label and change the ...
3
votes
1answer
275 views

Replicate Import Symbology Matching Dialog in ArcObjects?

In Arcmap I can render a layer with same symbolgy applied to different fields by way of re-importing the .lyr file and choosing a Value Field. How can I replicate this functionality in ArcObjects?
1
vote
1answer
4k views

Exporting Symbology from ArcGIS for Desktop to Microstation or QGIS?

I am using ArcGIS 10.1 for Desktop and trying to figure out how to export my symbols of elements in ArcGIS to CAD or QGIS readable format. The problem is, that I can export symbology to a Style, or ...
11
votes
2answers
3k views

After joining shapefile with CSV file graduated symbols option unavailable in QGIS?

I have successfully joined data from a csv file to a shapefile in QGIS but for some reason I am having trouble symbolizing my data. I want to use a graduated symbology however this option is not ...
6
votes
2answers
14k views

Using multiple attributes feature for symbology in ArcMap?

I am trying to make a map using US census data showing vacant housing to total housing on the same map. I came across the "multiple attributes" feature under the symbology tab and wondered if this ...
5
votes
1answer
956 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 ...
5
votes
3answers
5k views

Program to create EMF that conserves transparency

What open source tools allow for the creation of EMFs that conserve transparency in ArcMap? I tried VeryPDF and Any DWG to Image Converter, neither on actually gave me a vector file that provided ...
3
votes
2answers
226 views

ArcGIS crashes when trying category symbology?

I'm facing an issue with ArcGIS 10.3. When I try to use symbology type "category" the program crashes. It seems that is not a matter of data because I used the data before and nothing happened. The ...
2
votes
0answers
192 views

Is there a way to set different levels of transparency (opacity) for a polygon's border and its interior?

I have some polygons which I'd like to display with their interior displayed at a higher transparency than their borders. Right now, I am doing it by creating two separate layers with the same data ...
2
votes
1answer
643 views

How do I change graduated color class values with python?

I am trying to use python to adjust my graduated color symbols' class breaks and labels. The layer is a query layer tied to an SQL DB and I want to be able to execute my python (after the database has ...
2
votes
1answer
111 views

Create points symbology with more than one parameter

In QGIS i would like to create symbology for points layer where the symbology will take into account more than one parameter (currently two). i.e.: My points layer has street names and house numbers ...
1
vote
2answers
486 views

Read layer symbology class color with ArcPy

I am using ArcPy within ArcGIS 10.1 and attempting to read symbology from a *.lyr file created by a raster dataset within ArcMap. My goal is to be able read out the RGB (color) values assigned to the ...
0
votes
1answer
551 views

Using Unique Values Symbology in ArcPy?

I am using ArcGIS for Desktop 10.1 and Server 10.1 on my machine Windows 7. I am newbie in python & running simple python script for UniqueValuesSymbology it running fine if I use mxd as “...
14
votes
3answers
2k views

Best practices for visualising clustered features in web maps?

I'm looking for the best symbol to display clustered features in the ArcGIS Server JS API. I don't like the "fly-out" animated cluster symbol, as used in the Silverlight API clustering or the JS ...
7
votes
3answers
928 views

Should I use a discrete or continuous scale for coloring a chloropleth?

I am making a choropleth for an upcoming local race using D3. There are two candidates running for an election. For any given polygon on my map, if the red candidate has more votes, the color should ...
10
votes
4answers
7k views

How to use consistent symbology between multiple stretched rasters in ArcMap?

I have a series of continuous rasters representing the same phenomenon over time, so I need to use the same symbology across them all. So I set the stretched symbology of the first raster, with a ...
13
votes
3answers
5k views

Changing symbology at different scales in ArcMap?

I am using ArcMap 10 and I want to display my village parcel symbology differently at given scales. I have one idea to copy and paste same layer. But my question is that in a single layer, is it ...