A visual representation of an area-a symbolic depiction highlighting relationships between elements of that space such as objects, regions, and themes

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3
votes
1answer
400 views

making choropleth maps using PostGIS Windows

i read an article on chicago tribune blog about making maps, it consist on "making choropleth maps using PostGIS, TileMill, Mapnik and Google Maps" on Mac environnement, my question is how we can ...
15
votes
2answers
767 views

Which world map projection allows comparing countries by shape and size?

The Mercator projection increases scale along with the latitude. Greenland seems larger than Australia, when in fact it is much smaller. The equal-area projections however stretch shapes away from the ...
0
votes
1answer
726 views

How do you convert the radius decimals of a circle in Openlayers to Kilometers [duplicate]

Possible Duplicate: Unproject Radius with Openlayers with CRS:84 Projection I allow a user to draw a circle in Openlayers. I created an alert to show the radius of the circle. I now need ...
0
votes
1answer
2k views

How to change events in the Oncomplete Drag function in Openlayers

below is code that works for Openlayers drag function: drag = new OpenLayers.Control.DragFeature(polygonLayer, { autoActivate: true, onComplete: function() {alert('Are you sure this is the ...
0
votes
2answers
10k views

Openlayers How would i get a hover label over my polygon

make a hover/mouseover label for a polygon in Openlayers? I made a map with draw, delete and drag polygon function. Now I need to make a hover mouseover for this. How to get a hover label for ...
2
votes
3answers
5k views

Google Maps/Google Earth - KML Overlays and Custom Orientation

I am am trying to get the floor plans for our various buildings imported into 4 separate KML files, one for each floor level so that I can toggle them with javascript. I'm able to overlay our floor ...
2
votes
1answer
691 views

What is wrong with this Proj4 transformation?

I'm implementing support for WMS maps in my company's software. Servers return a list of projections their maps are available in, but our software only displays data in WGS84 (lat/lon or UTM), and ...
20
votes
3answers
2k views

How do I organize my GIS projects?

I have been struggling for quite a long time now with keeping my project files organized. What are your tips for keeping your datasets, images, shapefiles, etc.. organized?
20
votes
2answers
545 views

How do I safely store paper/hardcopy maps?

What do I need to consider when deciding how to preserve paper maps safely from the ravages of time? I am trying to understand some best practices when it comes to archiving and storing paper maps. ...
1
vote
0answers
496 views

GeoNetwork opensource - Geoserver/Google Maps integration

I'm using GeoNetwork 2.6.4 and I would like to change the default base map to Geoserver, adding a Google Maps Satellite Layer. Which is the best way? Any suggestions?
1
vote
1answer
362 views

Finding the max. zoom level containing imagery at a point in Google Maps?

Is there a way to find the maximum zoom level containing imagery at a point in GMaps? I'm wanting to automatically zoom my map in as much as possible when a user chooses a point, but sometimes there ...
4
votes
1answer
8k views

How to highlight the area in google map on mouse hover

I want to implement a feature in my app (gmap powered) to highlight the area on mouse over. Much like the functionality in wikimapia. Check out the pic or url But i could't find any info on how ...
5
votes
2answers
427 views

PostGIS ST_Distance vs. pgRouting

I am looking to create a city directory web app, and the site will need to be able to calculate distances between two geospatial points (like the distance between the user and a restaurant, or the ...
4
votes
5answers
287 views

Require a 3rd Party GIS service to embed in my application

I am looking for a service (Free or Premium) that allows offline access to maps and also gives the functionality to search map using an address or Latitude / Longitude. I want to embed it into a Web ...
0
votes
1answer
6k views

How to plot geographical coordinates in mapinfo?

I want to get started with mapinfo and plot some coordinates i.e latitude and longitute . How is it possibe?
2
votes
2answers
2k views

Google Maps JS API v3 - Polygon formation

So my big question here is how does the Google Maps API determine the "inner" versus the "outer" for a filled polygon? Playing around with the polygon creator @ http://www.the-di-lab.com/polygon/ ...
7
votes
2answers
2k views

What is the effective and legal way to get map tiles for the size of 2 or 3 states?

I would like to get map tiles possibly from Open Street Map (yes I am aware about tile usage policy and would not like to breach that) or other source for the purpose to serve it as offline maps to ...
5
votes
7answers
2k views

What map source/API/tools are recommended to create Web GIS/Mapping application utilising Microsoft technologies?

I'm researching about technologies (around Microsoft tech) to create mapping application and would like to have advice/suggestions. Brief requirement to build mapping application with Microsoft ...
3
votes
2answers
777 views

esri google maps api - Create a single GPolyline from an array of features

I'm using the esri google maps extension api... I have a esri.arcgis.gmaps.FeatureSet() (of type esriPolyline) containing an array of features (esri.arcgis.gmaps.Feature()). Is there a simple way ...
10
votes
4answers
377 views

Where can I find historic maps of city size?

I'm interested in examining basic dimensions of city size, primarily area (though population would also be of interest) from the earliest possible records. It does not matter where the city is in the ...
6
votes
5answers
611 views

Are the Canadian National Topographic System (NTS) maps available freely online?

I'd really like a seamless service of the Canadian topo maps, similar to ArcGIS Online USA Topographic Maps, http://www.arcgis.com/home/item.html?id=4ee3622f0bfd41eea55ffa83aaf31a9f If there is no ...
7
votes
2answers
6k views

Can I use Google Maps as a layer in Arcmap?

Is it possible?
21
votes
9answers
2k views

Are North Arrows Pointless?

A recent post on Cartastrophe refers to a "Worldwide Campaign to Eliminate Needless North Arrows." So when, if ever, are North arrows necessary? As an interesting aside the concept of North being ...