Hot answers tagged symbology
17
The INSPIRE data specifications define some standard styles for portrayal of topographic data (transport network, hydrography, administrative units, etc.). See for example the section "11.Portrayal" of this document for hydrography.
If you are looking for standards for the representation of style, see SLD and GSS.
15
The problem is to figure out how much to bend the arcs to enhance their visual resolution.
Here's one solution (among the many possible). Let's consider all the arcs emanating from a common origin. The arcs get most crowded here. To separate them the best, let's arrange it so they spread out in equally-spaced angles. It's a problem if we draw straight ...
12
Creating great circles could give you the desired effect.
Maybe something like discussed on http://postgis.refractions.net/pipermail/postgis-users/2008-February/018620.html
Update:
I've followed up on this idea in "Visualizing Global Connections". It's a purely PostGIS-based solution using reprojection to create arcs.
SELECT ST_Transform(
...
11
It's a great question. One standard set of iconic markers with which everyone in the world is familiar is their country's set of street signs: stop, yield, crossing ahead, etc. I hope the point of such standardization is immediately obvious.
Note that the actual meanings of many of the highway symbols are not intrinsic: they must be learned (especially ...
10
Another publicly available symbology set for crime mapping applications is the Crime Mapping Symbology (CMS).
http://emsymbology.org/Police_CAD-RMS/index.html
Intended Applications
The Crime Mapping Symbology (CMS) was created to be used in a web mapping environment.
The use of PNGs also allows for many desktop mapping applications to import the symbols ...
10
In traditional cartography, marker clustering is called aggregation or sometimes amalgamation. It is part of model generalization: When zooming out, some detailed concepts (e.g. the tree) disappear to be replaced by less detailed aggregated forms (e.g. the forest).
Many good examples can be found in good cartography books. Here are two examples from this ...
10
ArcMap just orders based on geometry type: 1. Points, 2. Lines, 3. Polygons.
My suggestion is to use transparency to help you symbolize these overlapping features. Take a look at a color wheel when you're selecting colors and choose colors that have good additive properties.
By using this technique you'll be able to identify the individual layers and ...
10
Polygonize your raster shape via the Raster-to-polygon tool in the raster menu. Use your field value as category
Click on categorized styling, classify and double click on the symbol. Then select "SVG-FILL" and the following dialog should appear with some basic SVG icons coming with QGIS.
Choose an icon and remember to set the border line ("simple line") ...
9
Usually, choropleth maps display densities and not populations. Displaying population makes the result too dependent on the subdivision. So, option 2 is certainly the most appropriate one.
To define the density classes, this document describes common methodologies. The quantile method is usually applied for choropleth maps.
8
Three options I can think of:
Save your map document and open it when you subsequently want to work with the shapefile. This should be obvious so perhaps you have not explained why this is not working for you.
Save the layer to a layer file and load that instead of the shapefile
Load the shapefile into a geodatabase and set up a cartographic representation ...
7
I recently noticed this project by the GeoVista group that is attempting to standardize map symbology for critical incidents (sponsored by the Department of Homeland Security). They have a few conference papers that should be helpful for standardized emergency symbols.
Note this also is not an international standard, but I would check out the references for ...
7
There's a lot of options and in fact I struggled through the same question a while back on some of my applications. And for our different products we ended up with different solutions. So you have to ask yourself
Are all of the singleton icons on the map of the same "kind" - same shape and color?
If they're not, do they all live on 1 layer, or multiple ...
7
One solution would be (I've no idea how you could achieve this with GUI tools):
cat gsv1Msymbology.txt | grep -v MAPPCODE | while read line
do
echo $line | awk -F" " '{print "<symbol>\n\t<lowervalue>" $1 "</lowervalue>\n\t<uppervalue> " $1 "</uppervalue>\n\t<fillcolor red=\"" $2 "\" blue=\"" $3 "\" green=\"" $4 ...
7
Redraw method should solve your problem, see my little example: OpenLayers: modifying feature style
UPD: I've modified my example a little bit: OpenLayers: modifying one feature style
7
I came across this video which explains how to make railroad tracks in QGIS using Symbol Layers - http://linfiniti.com/2010/12/video-tutorial-1-creating-a-custom-railway-style/
I realized I could use the same feature to make two-color lines using only one layer.
I wouldn't need to have a separate color attribute (since you can't style a single layer based ...
6
Not a Standard but possible the nearest to it:
But ESRI have re-vamped symbol sets and crime mapping has been added.
http://mappingcenter.esri.com/index.cfm?fa=arcgisResources.gateway
Application: ESRI, Web Mapping
http://blogs.esri.com/Support/blogs/mappingcenter/archive/2010/07/05/New-Crime-Mapping-Symbols-Available.aspx
Strengths - Freely available
...
6
The term you are looking for is Annotation Classes. These define different styles of annotation, and may use different attributes, but may be linked to the same feature.
This image shows a highlighted featureclass that represents sewer lines. They have 2 labels, on top is the length, on the bottom is the diameter and material. In the table of contents, ...
6
The problem most likely is that all CSV columns have been imported as text fields. Text cannot be used for graduated styles.
To fix this, you need a .csvt file for your CSV which specifies the data type of CSV columns explicitly. Basically, a .csvt file is a text file with only one line, e.g.
"Integer","Real","String"
For a CSV file with three columns. ...
6
Not that I know of plus it would be impracticable. Best bet is to use QGIS. Style them and save that style. Take the time to name it so you can recall it 2 months later. The style files can build up quickly. Check out this recent article about symbolizing in QGIS. ...
6
This is a common problem in Cartography. There is also an important Mathematical theorem on this, called the four color theorem
To use this in ArcMap, there was a sample tool for this, called the Map Coloring - Four Color a Map". If you are still at ArcGIS 9.x, you can use it directly.
If you are at ArcGIS 10, you can still use the tool, by registering ...
5
... such as a body outline for a homicide scene...
Summarizing: Standard Symbology is used for fast map reading.
I think that's the point of standard symbology, when you look at it you know what it means. The legend is indispensable indeed. But when you look at a standard symbol like a "body outline" the very deep of your subconscious tell you what ...
5
I believe stretched raster symbology is rendered via RasterStretchColorRampRenderer, so interfaces implemented by this class are a good start. The renderer is assigned to your raster layer through IRasterLayer.Renderer.
Stretch type: IRasterStretch.StretchType
High/low stretch values: IRasterStretchMinMax
Orthorectification is controlled by a different ...
5
You might obtain some inspiration from sunflower plots. This method, which has been in use for decades to represent clusters of points on scatterplots, capitalizes on research in visual cognition to produce markers that are rapidly and correctly discriminated as well as clearly related to the sizes of the clusters they represent.
Here's an example done in ...
5
Just prior to @Aaron s message, I used the information from @Roy to create my own solution that I could incorporate into am ArcToolbox script. See below:
# Import modules
import arcpy
#Get the current Map Document
mxd = arcpy.mapping.MapDocument("CURRENT")
# Script arguments
Template_Layer = arcpy.GetParameterAsText(0)
LayerList = ...
5
From your first link, your features must be polygon features. You have point features. You can buffer your points to create polygons from them, after which you should have the Transparency option in the Symbology-Advanced dropdown:
This option should be present in all versions of ArcGIS since 8.1.
See also this answer: Creating symbology for multiple ...
4
On a comical stance...
http://www.cartotalk.com/lofiversion/index.php?t2542.html
'emergency symbol library'
links to the map..
Homeland Security Mapping Standard - Point Symbology for Emergency Management
http://www.fgdc.gov/HSWG/index.html
Tip: Try an guess the symbols
4
Done in QGIS:
However there is a catch [as always] you can't save it [to shapefile anyway], once you save it they revert to ?. You also have to use Lucida Console font in order to get the symbols to show up. I just made the codes up and used the female symbol to test
EDIT: Turns out you can save it, with the correct ♀ and ♂ and even use other fonts, if ...
4
A fairly simple way is to snap the events to a grid. It's fast enough that potentially you can do it dynamically.
You can snap the points by means of a few simple computations before creating the events. Decide on the grid's origin and mesh size, using the same coordinate system as the (X, Y) values you have. Let the origin have coordinates (Ox, Oy) and ...
4
Are there any international standards for map symbology?
That question has good suggestions for map symbols. The accepted answer links to this document on hydrography.
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