Linked Questions

52
votes
6answers
31k views

Why is the 'straight line' path across continent so curved?

This is the result of mapping the straight line path from a point in US to Poland using Distance Measurement Tool. Also, planes from Asia to US would travel almost over North Pole. Why is the path ...
29
votes
9answers
5k views

Effectively displaying demographic data on a printed map

I would like to plot the following per zone (30 zones total) data on a printable/non interactive map: Average age Average household income Number of households Population density Number of people ...
25
votes
10answers
6k views

Existing solutions to automate generalisation/simplification of geographical data?

I am looking for existing solutions (softwares, libraries, methods, etc.) to automate the generalisation/simplification of geographical data as presented there, and also there. Do you know and use ...
30
votes
8answers
5k views

When is a 3D Visualisation in GIS Useful? [closed]

I can currently only think of two cases: to visualise potential changes in a landscape, such as the effect of adding windfarms, or the addition of a new building to an urban area. However both these ...
27
votes
6answers
13k views

Maximum number of point features in an OpenLayers vector layer

In your experience, how many point features can be added to an OpenLayers vector layer (new OpenLayers.Layer.Vector("Point Layer")) before it goes unusably slow? My use case is to display points from ...
14
votes
8answers
8k views

Examples of Web Maps

As part of an internal "learn at work month" program, myself and a colleague have volunteered to do a presentation: "The Wonderful World of Web Maps". To this end, we're now looking for examples of ...
10
votes
3answers
11k views

What is a “mashup”?

GIS users mix spatial data layers from an early age of GI science. What is new in the concept of "mashup"? Is it something really new, or only a trendy word?
4
votes
6answers
14k views

What are the elements that a good map should have? [closed]

I have drawn a map with some coordinate(longitude and latitude). What are good points that a map should have eg labels, legend, etc. Edit: The map if for the purpose of locating different objects ...
6
votes
5answers
4k views

Effectively displaying a large amount of data on Google Maps APi

I have about 20 layers that I'd like to put on a Google maps API. I assume I'll need some form of a tile cache server and perhaps under mapserver or geoserver. These layers amount to about 400mb so ...
17
votes
1answer
2k views

Eye-friendly colours for long periods of work

Apologies if this question doesn't fit the rules here. I am digitising a large amount of remote footways and I will be panning, zooming a lot and I've done 2 days on this so far and always get quite ...
7
votes
1answer
589 views

Represent Ternary Legend for IMG in ArcGIS Desktop?

I've got a composite image built up from Red Green and Blue composite colours. Each channel represents the differing concentration of a different variable in each location - with 0 being the lowest ...
2
votes
3answers
230 views

Multiple overriding rules for styling in QGIS 3.4.0

I am a total beginner to QGIS and still struggling with the basics. After a quick research on this forum I could not find the answer to my current issue. What I am trying to do is to colour the ...