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

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25
votes
4answers
3k 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 ...
23
votes
5answers
2k 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?
6
votes
1answer
1k 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
102 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 ...
5
votes
2answers
155 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 ...
3
votes
2answers
4k views

Change Symbology of layers from within ArcMap

Cheers, In an active Arc Map 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. ...
3
votes
5answers
261 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 ...
22
votes
5answers
1k 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 ...
11
votes
3answers
950 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?
8
votes
1answer
1k 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 ...
10
votes
4answers
7k 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 ...
7
votes
6answers
5k 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 ...
4
votes
2answers
5k views

How to change Symbology of Multiple Layers at once?

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.
7
votes
2answers
1k 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 ...
7
votes
3answers
2k views

Changing symbology as per scale reference in ArcMap?

I am using ArcMap 10 and I want to display my village parcel as per given scalewise symbology. I have one idea that copy and paste same layer. But my question is that in a single layer, is it ...
6
votes
3answers
1k 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
2answers
4k 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?
1
vote
1answer
888 views

Is there any way to set polygon features fill color and outline programmatically?

By some process I am creating a polygon feature layer. Before adding the layer in the map, I want to set polygon's fill color to no color and set polygon's outline color and width. I am working with ...
5
votes
3answers
2k 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 ...
1
vote
1answer
2k views

How to export Symbology from ArcGIS to Microstation or QGIS?

I am using ArcGIS 10.1 and trying to figure out how to export my symbols of elements in ArcGIS to CAD or QGis readable format. Problem is, that I can only export symbology to Style, or export map to ...
13
votes
3answers
1k 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 ...
6
votes
3answers
294 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 ...
9
votes
1answer
347 views

What is the best way to represent bridges using a point vector layer in QGIS?

I'm working on a hiking/biking maps of trails in the woods which sometimes have bridges that need to be shown on the map. I'm trying to figure out the best way to capture and represent them using QGIS ...
8
votes
3answers
573 views

How to present three spatial variables in one map? [closed]

I want to assign 3 category of variables in a single map. In other words, I have to produce a cartographic visualization of the damage including a legend listing: damaged surface area in the ...
6
votes
2answers
690 views

How to display an arrow pointing to a specific bearing in QGIS

I have a number of point features which contain an attribute I call "bearing" and another one called "slope". Each point has a bearing between 0 to 359 degrees. And the slope is either "+15" or "-15", ...
5
votes
1answer
401 views

ArcGIS Symbology Transparency

Using ArcGIS 10.1, I am interested in symbolizing a series of polylines to generate a pseudo-heatmap like one of the answers to this question. The essence of the solution idea is to symbolize each ...
5
votes
1answer
952 views

Is there a version of the ESRI ArcGIS Symbol Library PDF for ArcGIS 10, or some other cheat sheet 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 ...
7
votes
4answers
2k views

Symbolising One-to-many relationships

I have a polygon feature class which has various extent areas with a name which is unique I also have a table (in an FGDB) that has the extent names with a score value. But there can be many score ...
6
votes
3answers
3k views

View vertices in ArcGIS

In ArcGIS (I use version 9.3), is it possible to change the polyline symbology to show vertices? Or do I need to extract the points via Feature Vertices To Points? This becomes a pain if I want to ...
5
votes
3answers
260 views

Is there a recomended method for symbolizing inland lakes, streams and rivers in a topographic map?

I produce a lot of maps with inland lakes, rivers and streams overlaid over a dem surface symbolized with a color graduation (green for lows and brown for higher elevations) I also use a ...
4
votes
3answers
1k views

Are there any well symbols for ArcGIS Silverlight/WPF?

I'm looking for some standard map symbols for a silverlight app. Does anyone know where I could find these? Thanks!
4
votes
4answers
4k views

Symbology of contour lines in ArcMap

I have contour lines with height values from 0 to 1030 (sorted by height 110, 115, 120, 125). Values with in-between number (like 5, 15, 115, 135...) should be grouped and colored with same color, and ...
4
votes
2answers
421 views

What is the cause and solution of this ArcMap tint band drawing issue?

I installed ArcGIS 10 SP1 last week. My graphics card meets the spec and I'm up to date on drivers. I have a layer of parcels that are tint-banded in the MXD. At some scales, straight lines that ...
3
votes
2answers
2k views

Customizing label features using arcpy

I have a script that creates symbology for a polyline (contours) and then adds it to a .mxd file. My problem is that it picks the “FontName” as the default field to label on the map (see attached ...
3
votes
4answers
4k 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 ...
2
votes
0answers
198 views

Symbology levels are ignored in ArcGIS 10

I have a problem migrating from a ArgGIS 9.3 to a 10 geodatabase (both sde and file gdb). The symbology levels stored in the 9.3 database are not transferred. When migrated to ArcGIS 10.0, ...
7
votes
2answers
3k views

Modify raster layer display and symbology properties programmatically with arcpy or ArcObjects

I have over 1500 NITF files that I need to be able to modify the layer display and symbology of programmatically from within ArcMap. I need to set the properties outlined in red below: I've looked ...
6
votes
1answer
671 views

What server and API to use for displaying complex polygons with dynamic symbology?

Background I need to interface a map into an existing website which allows the user to query a database and which currently results in a table listing population statistics per county. For example, ...
4
votes
2answers
91 views

How to tell QGIS where to start marker line interval?

I want to tell QGIS where to start with a marker, like: use 3 markers, start at positions 0, 2, 4, and apply an interval of 12 to each marker. However, after searching for hours, I haven't found a ...
4
votes
2answers
175 views

Is there a way to auto-update symbology between .mxds for the same shapefile? (Python?)

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 ...
4
votes
1answer
424 views

Managing symbology in Feature Classes

I'm using an enterprise db to store my data and I'm writing a python tool that allows me to interact with that data in ArcMap. However, all my layers someone have "OTHER" for the symbologyType (not ...
4
votes
1answer
496 views

How to display marker somewhere in polygon without converting polygons to points, while maintaining dynamic legend, and then export map?

The following seems like a straightforward requirement because I recall ArcInfo Workstation having an ARCPLOT command called POLYGONMARKERS available to do the display part 20 years ago. Yesterday I ...
4
votes
3answers
736 views

How to place multiple symbols on one polygon centroid?

I am using QGIS for visualizing the health conditions of elderly living in an old age home, some of the elderly have multiple medical device with them and I want to show them on the map. Suppose I ...
3
votes
1answer
330 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 ...
3
votes
2answers
280 views

Looking for qml specification

Where I can find qml specification which is used for store symbology information in QGIS? Try to googe it - no result.
3
votes
1answer
3k views

How to I create and Import marker symbols (or 'Style References') in ArcMap 10?

I work with many different federal lands all of which can be associated with iconic logos (think National Park Service, National Wildlife Refuge System, etc.). I'd like to create a 'Style Reference' ...
3
votes
4answers
1k views

Canvec Symbology in Arcgis 10?

Is anyone working on porting the Canvec Symbology toolkit to ArcGIS 10? How would you go about it if you were? The canvec symbology toolkit is comprised of a canvec.style file (which is an ms-access ...
3
votes
1answer
353 views

Is there an international standard with GIS symbols for power distribution objects?

Like I said in title, Im wondering if there is a standard that points out symbols for power distribution objects, power plants etc... Thanks
2
votes
0answers
87 views

How to create good quality picture marker symbols with ArcMAP

I have created a nice clean symbol in Illustrator. After exporting to .emf format and appending to objects in ArcMap the symbol looks terrible (see Attatchment). Has anyone found a way to import good ...
2
votes
1answer
217 views

QGIS 2.0 - 2.4: Color Ramps Missing?

Since QGIS 2.0.1 the default color ramps and styling symbols seem to disappear for some users. For me, this started with QGIS 2.0.1 and still consists with 2.4. I can neither choose Smybols when ...