Questions tagged [maps]

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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32
votes
2answers
55k 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 ...
27
votes
3answers
5k views

Organizing 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?
26
votes
9answers
8k 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 up ...
23
votes
2answers
2k 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. ...
16
votes
1answer
27k 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 ...
15
votes
4answers
29k 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
2k 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
1answer
260 views

What is the meaning of this linear scale of angles on this 1951 map of Iceland from the U. S. Army Map Service (AMS C762)?

On the U.S. Army Map Service (AMS C762) 1:50,000 maps made of Iceland 1948–1951, there is a scale marking at the top which shows degrees, I suspect angles. In the image below it shows 25°–29°. It ...
14
votes
0answers
1k 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
2answers
2k 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). ...
11
votes
4answers
435 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 ...
10
votes
2answers
8k 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
3answers
11k views

OpenLayers maps issue with SSL

I am using OpenLayers map by using the hosted JavaScript: <script src="http://openlayers.org/api/2.13.1/OpenLayers.js"></script> But my client has SSL installed and when I try to run ...
9
votes
1answer
156 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. ...
8
votes
1answer
10k views

leaflet show miles/kilometers

Googlemaps shows you how large an area is on a map by showing a small bar with the number of miles/kilometers at the bottem left. Does leaflet also support this somehow? I do not see it listed in ...
8
votes
4answers
5k views

Create an inset map in R

I need to create a map of my sampling site, and the journal requested to make an inset map showing where in the world this map is, this is my map code. library(maps) library(GISTools) map('state', ...
7
votes
1answer
11k 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 ...
7
votes
1answer
7k 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 ...
7
votes
5answers
1k 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
3answers
12k 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 --------------------...
7
votes
2answers
3k 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 ...
7
votes
1answer
132 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
773 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
2answers
954 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 ...
6
votes
1answer
5k views

Enabling all layers by default using Leaflet?

I am using leaflet maps to compare heat layer and marker layer. I've an option to add multiple marker and heat layers dynamically. For me Heat layers are enabled by default as on when user adds new ...
6
votes
1answer
193 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% ...
6
votes
1answer
3k 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 ...
6
votes
0answers
110 views

Scaling x y coordinates in qgis print composer while using atlas generator [duplicate]

So I am using QGIS 2.18.0 and have made a map template that uses the atlas generator in the print composer. It uses the grids settings for the map to add UTM north and Eastings along the sides of the ...
6
votes
1answer
771 views

Map on canvas renders after image saving [duplicate]

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 * ...
5
votes
2answers
622 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
64k views

Truck Routing in Google Maps?

I know that Google Maps does not have a truck routing feature , ie, changing the route if a low bridge is detected. Is there a way I can implement this in Google Maps using a 3rd party API? If yes,...
5
votes
1answer
2k views

Displaying polygons with colour gradients that changes at value 0 using QGIS?

I am plotting some model outputs in QGIS and let's say I have got a given number of polygons and for each one a value which can be negative OR positive. I need to assign to each polygon's value a ...
5
votes
1answer
885 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 ...
5
votes
1answer
591 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
373 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
2answers
5k views

Does Google Maps Elevation contain buildings, trees, and other structures?

Does anyone know whether Google Maps Elevation data removed buildings, trees and other non-terrain related structures from its elevation data? I checked their pages, but couldn't find an answer to ...
5
votes
1answer
345 views

Packing polygons without intersection and empty places [closed]

How can I pack polygons without empty places and intersections? Please tell me everything that might help me (API, algorithms, etc.) I'm using: USPS API to get carrier routes. dbscan.js to ...
5
votes
1answer
3k 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 ...
5
votes
1answer
2k 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. ...
5
votes
1answer
2k views

Is there any free or open offline satellite/aerial imagery for commercial use?

I'm developing a product for offline use in Brazil in rural areas where there is no Internet connection. I'm searching for a free imagery source which can be used offline in a commercial product. ...
4
votes
2answers
3k views

Drawing pie charts with vectors with OpenLayers?

Has any one got any examples of drawing pie charts with vectors as markers with OpenLayers?
4
votes
2answers
32k views

Offline Maps API for C# Desktop Application?

I have a C# WPF application which has browser control to display a Google Map. Google Maps API v3 is being used in the application. I use data received from a service to plot users current location ...
4
votes
5answers
375 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
300 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
20k 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 to ...
4
votes
2answers
213 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
554 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 ...
4
votes
1answer
276 views

Is there a tutorial explaining the basics of WMS?

I'm building some software that needs to download satellite map images to display behind some survey charts. I understand that, to download these images, I need access to a Web Map Service. The only ...
4
votes
1answer
2k 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 ...