The study and practice of making maps.

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16
votes
1answer
338 views

What do these curly graphics represent on this map?

What do the two curly graphics to the left and right of this map represent? They are the only two on the map and seem to be attached to the border of an area. I'm sorry I haven't posted the full ...
4
votes
3answers
120 views

Alternative layperson-friendly names for 'Legend'?

I am making a mobile mapping app that has a button that displays a legend. Because my legend is initially hidden from view, it is really important the text I put in the button that displays the ...
3
votes
2answers
92 views

How to map Traffic Count Points to Streets?

I've got point data representing traffic count locations and I am trying to figure out the best way to represent them on a map.I thought about kriging to provide a continuous surface but I don't think ...
0
votes
1answer
54 views

Calculate length of 2,000 paths - lines in Google Earth?

I have ~2,000 paths/lines drawn in Google Earth and I would like to know their cumulative length. How can I do this easily? I have been able to convert into excel the Lat & Long of each point in ...
2
votes
0answers
157 views

Splitting a bounding box into n amount of bounding boxes

Firstly, I've never worked in the GIS area before nor do I have much knowledge of the mathematics behind some of the stuff I am trying to implement. Perhaps i'm getting in over my head. My Situation ...
3
votes
1answer
332 views

Change Circle Size According to Value using R

How do I change circle size in a population map according to the population density of the location? library(maptools) library(RColorBrewer) library(classInt) library(maps) ## load the file ## pop ...
0
votes
1answer
192 views

Plot specific area of map

Is there a way to zoom in a map on an R spatial polygons object. i.e. if I have polygons for a whole country but I want to zoom in on a specific city and just plot that area how do I do that ? At ...
3
votes
2answers
204 views

Breaking a range of values into buckets for a gradient

If I have a range of values and want to make a choropleth map with a gradient, what algorithms are out there to determine the value ranges for the different colors in the gradient? For example, if I ...
5
votes
1answer
1k views

Labeling contour lines in ArcMap [duplicate]

Can anybody give me advice on how to label contours as shown in Figure 2 below? I would like to be able to put the label "on" the line, which is easy enough. But I'd also like for the contour line to ...
2
votes
1answer
816 views

Polygonize.py outputs into a single file or simple merge?

Given an unique raster topographic file at start, I want to get vector polygons for elevations thresholds 1m, 200m, 500m, 1000m, 2000m into a single shp file. I first slice my raster into 5 (or more) ...
1
vote
0answers
27 views

Mapserver mapscript map inset

What is the recommended way to produce a map similar to the one in http://www.nexusenergy.com.au/6468050/nexus-energy-oil-gas-exploration-and-productio.htm I would like to dynamically create the ...
0
votes
1answer
173 views

Gdal_polygonize: How to filter pixels above a given value (elevation)?

Given a topographic GIS raster of one country: Given an elevation threshold n = 50 (meters) How to polygonize pixels when z >= n ? gdal_polygonize.py is not clear on this point. It states This ...
1
vote
1answer
28 views

Searching 'select by color' for raster or map data

I'm planing to create an online map component with which the user can create/draw polygons based on underlying raster data. Is there some library / tool / procedure existing which enables the ...
1
vote
1answer
26 views

Network segment gaps, when offset

I'm having an issue when offsetting a line shapefile. For some reason when the lines are offset, ArcGIS isn't drawing some segments although the segments are there confirmed via “identify”. Has ...
2
votes
1answer
582 views

Population density map

I have California population density data from from the U.S. Census in an Excel file. The spatial information is provided in ZIP Code Tabulation Areas (ZCTAs). How do I plot a population density map ...
0
votes
2answers
156 views

How to count record points within a given area (electoral district)? [duplicate]

New user to GIS and to QGis but experienced data user. I have shapefiles for a state legislative districts. I have a set of individual voter records that I have geocoded. What I'd like to do is ...
0
votes
0answers
28 views

How Can I add a WMS from ArcGISServer10.1 using GoogleMap Javascript api?

RT. I am using google map api ,but I have personal data with WMS in the ArcGISServer,I will add this wms layer on the google map,who can help me ?
3
votes
1answer
180 views

Bar graph - cartodiagram in QGIS

Can I create a cartodiagram in QGIS 1.7.3? I need one bar graph in every territorial unit of one layer. It must vizualize organization on X and number of research in one organisation. Is it possible? ...
1
vote
1answer
227 views

Forcing Lat/Lon Bounding Box to appear on LCC Projection Map in matplotlib-Basemap

I'm trying to do some plots of data on a basemap of Australia using matplotlib-Basemap. I'm finding the interface for creating the basemap to be tricky. Specifically, I have lat/lon definitions for ...
5
votes
1answer
5k views

How to create and re-use my own map template in Arcmap 10.1?

I am working on a project which requires 5 different analyses on the same data. I created five map documents (.mxd) and completed my analyses. Now, the problem is that I want to export my results in ...
0
votes
0answers
268 views

US MAP using Zipcode in R [closed]

I have a set of US zip codes grouped into two groups. I'm plotting those two groups on US MAP using R code. I'm using following code to plot group A & B combining together ...
2
votes
1answer
183 views

Cartographic Representation: how to use different rule for different polygon?

I create a file geodatabase to hold a polygon of the land boundary. What I would like to set up the RULE to separate colors. I had to split the polygons into 2 separate polygons and change the ID to ...
1
vote
2answers
1k views

Exporting maps at high resolution for a specified area

I am using ArcGIS 10.1 and am very new to it. I have Bing Maps aerial imagery of a particular road intersection and I want to export the map as a TIFF at a 1:1000 scale. When I zoom in and then use ...
0
votes
0answers
166 views

How to have polygon labels always display using GeoTools 8?

I'm not able to consistently display labels for polygon features. The label is not displayed, as far as I can tell, unless the polygon is large enough to contain the entire label string. I can ...
3
votes
2answers
1k views

How to make a raster layer transparent via MapServer

I loaded a PostGIS raster Data through OpenLayer and Mapserver. The code inside the OpenLayer is as following : localWMS = new OpenLayers.Layer.WMS( "Local WMS layers", ...
0
votes
0answers
136 views

Map doesn't show anything in img file (WMS-Mapserver)

Actually in a practical Project we wanted to use OpenLayer and MapServer to display our data using WMS, but We can't find a proper srs or EPSG code. One of the ITC students said, we have to change our ...
1
vote
0answers
84 views

Is it possible to use USGS .shd files in QGIS?

Has anyone successfully used QGIS with US Geological Survey shd files to map geology - specifically to display colors and geological symbols (dip/strike etc) stored in a USGS supplied shd file. ...
1
vote
1answer
148 views

How to improve the color matching between a scanned image of a map and the original?

When I scan a section of paper map using a Canon Lide 200 A4 scanner, the resulting image has colours which are not true to the original. The most annoying is where the predominantly white paper ...
3
votes
1answer
112 views

How to annotate north arrow's degree rotation in ArcGIS 10.1

I rotated my data frame for a map, and the north arrow dutifully is rotated as well to show north. I've been told it's possible to annotate the degree rotation on the north arrow symbol itself, but I ...
0
votes
0answers
18 views

Representing population variables in a map [duplicate]

Could some one advice me in some ways (or popular ways) of representing population variables in a map? For population variables I refer to: distribution of age among the population, people with ...
1
vote
3answers
1k views

how to create grid to divide large map into smaller sections

This seems like it should be easy but I just can't find anything online that tells me how to do it. I have a map of small remnants of forest along creeks for an entire county in California. I need ...
3
votes
1answer
198 views

Fix Labels United States Map Help R, R-Studio?

Does anyone know how to deal with the labels that do not fit within a states boarders? I need the labels on the east coast to be moved outside of the state and a line drawn pointing to the ...
2
votes
0answers
111 views

How to visualize fuzzy/approximate locations

I need to visualize a mixture of accurate and fuzzy/approximate locations on a web map. The user should be able to instantly recognize approximate locations from the marker used. Are there any best ...
9
votes
2answers
472 views

Can I sell maps to third parties if I have Google Earth Pro License?

Not sure if this question is suitable for SE but I can't find answers anywhere else. I work as a GIS Analyst for a mining company that has its own GEPro license. As part of my job, I make PDF maps, ...
4
votes
1answer
124 views

How to avoid cutting labels along the map border?

I am labeling areas on a map (for example, forest (coniferous, deciduous trees), swampland, and so on). A cartographer has criticized it because labels which extend beyond the boundaries of the ...
0
votes
1answer
93 views

how to improve poi visualization in tilemill

I have imported all points of interest (POI) from database to TileMill. The distance between the POIs are a few meters. Thats is why its became ugly looking map. Is there any option that will ...
1
vote
1answer
344 views

Overlay points over gadm map

This is a crosspost with stackowerflow and I hope for understanding and that it will no be closed as it concerns both cartography and R. I have already asked about plotting points dependent on ...
2
votes
0answers
123 views

Plot points map of population [closed]

I want to plot kind of isarhytmoc points map like in this tutorial, but with population data. However, unfortunately, I have no enough skill and only came with such code: require(sp) require(rgdal) ...
0
votes
1answer
168 views

How to symbolize features in QGIS?

Why is a shapefile shown as coloured independent features in ArcGIS shown in a single colour in Quantum GIS? What can I do to display this layer (wwf ecoregions) with the different ecoregions ...
10
votes
1answer
2k 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 ...
6
votes
4answers
683 views

animated map in R

everybody, sorry for disturb, but I am being quite new with r faced a crucial difficuty: I want to create an animated map of Russin with changes in unemployment with differnt years, like. On the image ...
2
votes
2answers
326 views

How can I create a legend with the new data defined symbols functionality?

I have a large geology data set that I need to display using an industry standard set of symbols and colours. The symbols and colours are attributes of the data. I have been using the data defined ...
5
votes
2answers
415 views

How to remove white gap in ArcMap Legend

I have a legend created in ArcMap 10.1 which appears to be generating an abnormal white gap to the right of the legend content. Any tips on how to possibly remove this would be appreciated.
8
votes
2answers
450 views

Problem with plotting map in R

While plotting the gadm map of Russia in R, I have a problem at the 180 degree meridian, where part of the Russian region is plotted separately. You can see it on the plot using the following code ...
2
votes
1answer
477 views

Can I view the Geoserver zoom level in QGIS

I am creating some sld's using QGIS for use in Geoserver and wanted to view the current zoom level so that I can then define it in the zoom level. Is this possible? For example <!-- Local ...
0
votes
0answers
759 views

Unable to dynamically locate map boundary coordinates in OSM/Leaflet

I have been trying for the past hour to take the coordinates of the map edge in a OSM/leaflet application I am making. While I can get the coordinates of the center, and I can get the coordinates of ...
2
votes
1answer
61 views

How does Mapnik Map Similar Features to Images

General Problem I want to be able to select all nodes inside of a bounding box that have similar properties. A good example would be: Map features that represent vegetaion. In other words: Basically ...
1
vote
1answer
448 views

Conversion problems from mappoint to screenpoint using ArcGis Javascript API

I am getting a very strange problem when converting from mappoint to screenpoint. I am using the following code: var sp = esri.geometry.ScreenPoint(512, 151); mp = map.toMap(screenPoint); ...
1
vote
1answer
74 views

How to scale map appropriately?

I am suppose to make a map. The specifications are 1:50k scale centered on a certain point. They want to view a distance of 30 miles from that centered point, but when I scale to 1:50k the map is ...
0
votes
1answer
76 views

map does not show up

I spent to much time working on a project, I saved it .. I'm sure now when I open it again .. arcmap does not display my map ..the layers there and everything else but the map's not displaying , It ...