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4

You could use the freely available Level 2 GADM shapefile data for Greenland, which comes in EPSG:4326 (Lat/Lon projection) by default, and import it into R using the GDAL functionalities offered by the rgdal package. Then, define the geographic extent for Washington Land and crop the previously imported shapefile. Make sure you have all the required ...


4

For the points you gathered from google maps, you should use WGS1984: GCS_WGS_1984 Authority: Custom Angular Unit: Degree (0.0174532925199433) Prime Meridian: Greenwich (0.0) Datum: D_WGS_1984 Spheroid: WGS_1984 Semimajor Axis: 6378137.0 Semiminor Axis: 6356752.314245179 Inverse Flattening: 298.257223563


4

Here is how I solved it. L.tileLayer does accept bounds parameter. I found it by digging into the code, but it is currently missing from the documentation. This fixed it . L.tileLayer(config.ISLAND_IMAGERY + '/tile/{z}/{y}/{x}', { zIndex: -4, subdomains: ['', '1', '2'], bounds:[ new ...


3

Yes. You can add in a second map to use as an overview map. You need to lock the features on your your original map first using the Item properties tab. There is a tick box for this in the Main Properties section. You then get QGIS looking how you want the overview map to look and then add it in using the print composer in the same way you added the first ...


3

The degree to which a name describes the thing itself is called semantic fitness. The term has been used in the context of toponymy, but I wouldn't call it "widely used".


2

I have recently implemented a similar thing. You need a routable road graph. Have a look at underdark's tutorial on using PGRouting on OSM data. It will tell you how to set up a routable graph. Once you have the routable graph you will have a set of nodes and a set of roads. The nodes correspond to the start and end points of the road lines. As your ...


2

The Google Maps Android API allows you to easily add your own, custom, tiles to the map. Essentially, you add a TileOverlay instance to your map, which uses your custom TileProvider implementation to provide the tile images. See the API docs for TileOverlay. In our software, Mappt for Android tablets, we have used the tiling system to load both local and ...


2

OpenLayers.js: i would recommend you to download the lib and link it to your application server. This way you can have total control over its URL and content. "insecure content" warnings: that happened to me too. In OpenLayers 2.13.1, when you instantiate an OpenLayers.Layer.OSM, it is configured by default for HTTP. From OpenLayers.Layer.OSM doc: url ...


2

AE and AP are postal service designations to get mail to US military personnel overseas, not real locations on a map. Puerto Rico is a US commonwealth, not a state, but not an independent country, either. If your mapping requirements include Puerto Rico, then you should include Guam, the Marshall Islands, and other US possessions as well. If you spend too ...


2

Unfortunately the answer to many of your questions is tied into the history of the USGS mapping program and decisions made, reversed, and reimplemented along the way. I don't know the specifics for that exact scale option, nor a more current version of the resource mkennedy mentions. I stumbled across a pdf earlier from I thought 2011 where a USGS official ...


2

See http://www.google.com/help/terms_maps.html Restrictions on Use. Unless you HAVE RECEIVED Prior written authorization from Google (or, as applicable, from the provider of Particular Content), you must not: (a) copy, translate, modify, or make derivative works of the Content or any portion thereof, (b ) redistribute, sublicense, rent, publish, ...


1

solved It: function calculateArcPointsGeo(center, radius, startAzimuth, endAzimuth, segments) { var pointList = [], point, i, d = radius / 1000, // d = distance in km R = 6371, // km, R = earth's radius (mean radius = 6,371km) lat1 = deg2Rad(center.Y), lon1 = deg2Rad(center.X), ...


1

Not a complete answer! I don't know how to identify what areas had 1:25,000 mapping done. You might try searching the Federal Register based on the information below. USGS published Maps for America (3rd edition, 1987) by Morris M. Thompson. On page 109, it states "By 1978, published 1:24,000-scale topographic maps were available for about 70 percent ...


1

So the problem with the code was that the id field for the shape file and for the csv file were defined as character (Thanks to Mark Weber for this observation). The new code is: library(micromap) library(rgdal) library(ggplot2) setwd ('C:/Users/Jesus/Dropbox/linked maps/Chapter4') mexico<-readShapePoly("mexstates.shp") gdp<-read.csv('mexico.csv') ...


1

It looks like you have used a Clip option on the Data Frame tab of your Data Frame properties for the data frame that you are using as your overview. The ArcGIS Online Help describes Clipping the Data Frame. Change its current setting to No Clipping and I think you will see your Extent Indicator in its entirety.


1

The official OSM tile servers don't provide any access via SSL. They are shared public goods and shall not be used by apps with heavy traffic. If you want to use them anyway, you must be ok with the "some content isn't encrypted" message at the browsers. If you want to have full encryption, you need to pay for commercial map CDNs with SSL: ...


1

I would recomnmend the following based on my experience Use a program called GPSMapedit to create your map. We have used it to make our own GPS Routeable map of the entire Philippines Buy a simple Garmin Nuvi GPS that save's tracks. Drive your entire site, stop and add POIS with details as you need Upload the tracks into GpsMapedit as gpx files. You can ...


1

TiledMapLayer in esri-leaflet seems to handle diplaying cached ArcGIS Server tiles only where they are present without writing any code pretty seamlessly. (pan this example app north into Canada to stop loading US Demographic layers) are the 1KB request/responses in other areas problematic?


1

The map lite doesn't have a zoom, but I did find that if you go to the map, zoom in to the level you want it at and then set up the embed settings, you will get the zoom level you want.


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This doesn't appear to be a feature of Map Engine Lite (the new embed API for one's own maps). However, there seems to be a workaround for the time being, though I imagine they may do away with it at one point: Create your map in Map Engine Lite Choose "Export to KML", checking the box "Keep data up to date with network link KML", and download the ...


1

You definitely cannot write a program to download and save Google tiles. When IE does that a) it is the google control instructing IE to do it- IE is not doing that on its own b) IE is making transient copies for the purpose of display, the intent is clearly not to save them


1

The Google Maps API v3 added a Drawing Library sometime last year; users can create any kind of singular geometry by drawing on the map. Unfortunately, it doesn't natively support adding comments or any kind of attribution, but if you were developing a Maps API application you could listen for the "overlaycomplete" event(s) (e.g. polygoncomplete, ...


1

Another great app for your purpose is MakeaClickableMap http://www.makeaclickablemap.com It has many options to color states, assign URLs to them, show/hide map labels, show text box on mouse over etc. Disclosure: I wrote it. :)


1

Straightforward authoritative correct answer: 591657550.500000 / 2^(level-1) it gives you the table above, entering the zoom level. Try it live on jsfiddle.net Because the question is only for Google MAPS, not EARTH, the OP doesn't care about 3D geometry. Google maps are ALREADY flattened so 1 pixel is always the same distance (in DEGREES, which is what ...



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