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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38
votes
5answers
24k views

How to make beautiful maps in R?

There are quite some nice possibilities to analyse spatial data in R and in the context of my current project I would like to use R more frequently to do that. Until now I plot my maps with ggplot2 ...
23
votes
3answers
3k views

How do I organize my GIS projects? [closed]

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?
21
votes
9answers
4k 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 ...
20
votes
2answers
972 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. ...
18
votes
2answers
15k views

Clipping a raster in R

I am building a map for the northeastern U.S.A. The map background needs to be either an altitude map or a mean annual temperature map. I have two rasters from Worldclim.org which give me these ...
15
votes
4answers
17k views

Free download of Soviet topographic maps (also known as Genshtab maps)

In the past, http://poehali.org/maps/ offered a free-of-charge download of Soviet military topographic maps of many areas in the world. Those maps are in the public domain. Now, this site redirects to ...
15
votes
2answers
1k 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 ...
14
votes
0answers
366 views

How to implement a “Snap to Road”-functionality? [duplicate]

I am having a problem with a little application I'm trying to develop. What I do is take a phone with me and drive around the city on a bike. I collect all the Latitude/Longitude-pairs and at home I ...
12
votes
1answer
15k views

How can I render latitude-longitude coordinates on a map with D3?

I am trying to overlay dots of arbitrary sets of longitude-latitude coordinates on top of a United States map. So far I have found the D3 cartography example, but when I try to place dots on X,Y ...
11
votes
4answers
401 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 ...
11
votes
2answers
454 views

Point overplotting on maps in R (e.g. with ggplot2) - how to push points to the side, mark original positions, combine close-by points …?

I've got a database containing languages, their longitudes and latitudes and a feature value (either category 1, category 2 or both - in the plot these are marked red, blue and green respectively). ...
9
votes
2answers
6k 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 ...
9
votes
1answer
128 views

Is there a name for a situation when the place is clearly or unclearly named?

This is not specific to any system. Suppose there's a large red rock on a terrain which can be easily found and clearly seen and there's an artificial object such as a mall near that large red rock. ...
9
votes
3answers
2k views

iPad mapping application with custom maps

I'd like to load custom maps onto my iPad and use them offline with the GPS for navigation. These are maps I can prepare in any format and projection. Is there an application that can take, for ...
7
votes
6answers
77k views

How to change default zoom in the Google embedded map?

I am having difficulties to change the default zoom level when I open the iframe below in my site. Can anyone please help me to set zoom level when following iframe is opened? <iframe src="http://...
7
votes
5answers
905 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
1answer
101 views

Why are heights given at various points on roads?

In the OS 1:25000 map below I have circled some numbers next to roads. The key says "Ground survey height" and there is another entry (in brown) for "Air survey height", but since all the data in the ...
7
votes
3answers
184 views

Resources for Learning 508 Compliance/Accessibility Requirements for GIS Figures

Does anyone know of any quality resources (books, papers, presentations, websites) for learning about 508 Compliance/Accessibility requirements in relation to cartography (GIS figures and templates)? ...
6
votes
4answers
1k views

Can someone help me identify this part of the map?

I'm sure 1 is a road, but what are those bumps on the side? I'm guessing 2 is a footpath. I have no idea what 3 is, if you don't know what it is, fine, let's leave it at that. I searched for what ...
6
votes
3answers
4k views

How to know if a point is inside a rectangle on the map?

I have four points that represent a rectangle (a,b,c,d). I got these points from mobile GPS. In my database I have this table of business locations: bussId | longitude | latitude --------------------...
6
votes
1answer
710 views

Loading a png image as a map with ggplot2/ggmap

I am trying to find a workaround for ggmap's missing support of world maps (i.e. you can't create any maps that show latitudes > 80°, due to idiosyncrasies in the mapproj package). To a limited extend ...
5
votes
2answers
517 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 ...
5
votes
1answer
4k views

Google maps android vector rendering : how do they make it that fast?

Most of the question is in the title. If you are on android (I believe its the same on IOS) and use maps you will notice the quality of the maps app and how the vector maps are drawn in a very fluid ...
5
votes
1answer
3k views

Adding Multiple Maps in QGIS Composer?

I am working with QGIS Composer 2.0 and I would like to add a second map. What I would like to do is to have a main map that takes up the majority of the print area. This map, Main Map, will have ...
5
votes
2answers
1k views

LeafletJS: Load Tile Layer based on bounding box

I have a LeafletJS map application with lots of layers. I have a few layers that only have imagery for certain regions across the world. Because everything goes on a world base map. All tile caches ...
5
votes
1answer
141 views

How to add a topographic map to a shapefile?

I wonder how it's possible to add this topographic information (elevation) to the map of Santa Cruz Island and all of the Galápagos Island that I have here. library(rgdal) library(rgeos) library(...
5
votes
1answer
290 views

Transit webapp development (journey planner)

I am going to develop a journey planner (like Google transit), i was just wondering that if there any opensource API available that can help me, or i have to do every thing on my own. And where can i ...
5
votes
1answer
229 views

Simulating Random Agent Movements along Roads on Map

I need to simulate agent movements on map as follows: Agent starts a known location and moves along a road. At each road intersection, the agent uniformly chooses one possible road and moves along ...
5
votes
1answer
172 views

How many GIS projects deal with just basic “putting markers on a map”?

Is there an academic paper or conference contribution, where someone estimated how many GIS projects actually deal with only a very basic usage of GIS data? Something equivalent to the infamous "80% ...
5
votes
1answer
147 views

Map on canvas renders after image saving

I'm a beginner to Qgis and Python; i need a script (don't need it to be a plugin) to get maps of selected features from a layer satisfying certain conditions; Here is my code: from qgis.gui import * ...
4
votes
5answers
339 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 ...
4
votes
3answers
268 views

How to print from arcpad without buying more Esri sofware?

I am running ArcPad 10 in windows 7 on a laptop and on a field unit consisting of an Ashtech MobileMapper 10 as a PDA talking to an SXBlue GPS. This system provides the real time half meter (without ...
4
votes
1answer
14k 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 ...
4
votes
2answers
201 views

How to solve loading performance issues when handling multiple KMLs?

I am using over 10 KML in Google Maps. When I increase the number of KMLs they load too late. I use checkboxes to hide/show KML layers. With up to 5 KML layers, it worked fine. When I increase the ...
4
votes
1answer
1k 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 ...
4
votes
1answer
124 views

I'm generating a Google Street View URL that works in Chrome but not Internet Explorer. What's wrong?

I've made a small add-in in ArcGIS that allows a user to open their current GIS view in Google Maps and also to select a location to open in Street View. The map view works in both IE11 and Chrome. ...
4
votes
1answer
497 views

Digitizing contour lines from paper maps using QGIS?

Is it possible to give digitized altitude lines (from paper map) heights using QGIS?
4
votes
1answer
490 views

Interactive maps for a survey - Are there any tools yet?

i am working on a draft for an online-based survey. I would like to enable the participants of the survey to draw polygons, lines and points (several) on a basemap (e.g. google maps) and (extra ...
4
votes
1answer
253 views

Does Oracle MapViewer support PostGIS?

I use Oracle MapViewer to generate my mapping data and currently I'm using an Oracle database as my spatial back-end. I would like to move my data over the PostGIS but I can't find any references if ...
4
votes
1answer
2k views

Texture overlay in d3 map

D3 map can be drawn and colored as shown in this example : http://techslides.com/demos/d3/d3-world-map-zoom-points.html. I need to overlay a texture or image within the boundary of a given country. Is ...
4
votes
0answers
236 views

How to make a visual realistic map containing mountain hiking trails/tracks?

I would like to try making a map that visually reproduces a mountain/hill and contains hiking trails, just like this one: http://i.stack.imgur.com/PdcnM.jpg I imagine some steps like this: Generate ...
3
votes
2answers
5k views

Openlayer maps issue with ssl

I am using openlayers map by using the hosted js : <script src="http://openlayers.org/api/2.13.1/OpenLayers.js"></script> But my client has ssl installed and when i try to run my map ...
3
votes
2answers
151 views

Plot tilted map in R

I would like to plot a tilted map, similar to the image below. I would prefer to do this using ggplot2 but I'm glad if there is a solution using base R. Any ideas on how to do this? Here is a dataset ...
3
votes
1answer
785 views

R - How to “smooth” a raster map

I am trying to create a map from raster data. The file came from a crop model, with resolution of 0.5 degree. Even when I disaggregate it (i.e. increase spatial resolution), the map looks really ...
3
votes
2answers
540 views

Examples of ASCII-art maps

According to Wikipedia, ASCII-art is one of the earliest techniques used for digital graphical design. An ASCII-art technique can be traced back to 1939 and computer-art pioneers have used it since ...
3
votes
1answer
28k views

How to open a map from gdb?

A librarian has helped me create some maps, and I need to open them. He is off work at the moment and I am in a rush for this. I have downloaded ArcGIS and he says I can open this with arcMAP. He has ...
3
votes
1answer
76 views

Change the language of OSM maps in QGIS

I would like to create small walking paper maps of Chinese cities parts and thought to use QGIS(print pdf + via plotting). With QuickMapServices plugin I added the map and of course the street names ...
3
votes
2answers
1k views

Drawing pie charts with vectors on OpenLayers?

Is anyone got any examples of drawing pie charts with vectors as markers on OpenLayers ? Cheers,
3
votes
1answer
99 views

Plotting netCDF4 data with the right projection

I guess this will sound simple to you but I just cannot get the right plot within R. I have a netcdf4 file and would like to visualize it within R just like I would do in QGIS and ArcGIS. sample data ...
3
votes
1answer
372 views

D3 missing zoom Choropleth + Raster

Following this example and Choropleth from Mike's site I am trying to get: image + vector + choropleth = my map As you can see I lost the zoom capability on the vector layer. I have been trying ...