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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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 ...
4k views

How accurate is Google Maps when entering lat and long from a survey drawing

How accurate is inputting the latitude and longitude from a survey pin into google maps to look at the site location? The problem I am trying to understand is I am about to purchase a property in ...
1k views

Finding Statistical Area (SA) in which address (Lat\Long) lies via R Point in Polygon?

Australian Bureau of Statistics (ABS) provide census information for all Australia. However, ABS has its own division of a state/suburb/town called Statistical Areas Level 1-4 (SA), which is different ...
213 views

How to calculate if a turn is required from a set of coordinates?

I have some polyline data that represents a navigation route generated using Dijkstra's algorithm. Along this route I would like to calculate anytime a turn is required. Ideally, this would be some ...
4k views

Approximate distance between two points (longitude / latitude) without Haversine

How can I judge from the long/lat coordinates of a point A alone whether it is possibly/certainly not within a short distance of x meters from another coordinate B, using R (without applying geosphere:...
69 views

Visualizing lat/lon pairs on a map, locally

I have a sensitive list of coordinates that I've already managed to geocode locally and now need to visualize on an interactive map. They're all contained within a particular neighborhood of the same ...
298 views

Shapes don't match google maps QGIS 2.18.7

I have some shapes (in EPSG:4326 wgs 84) that match with Openlayers ->google street maps only when I do enough zoom-in. But When I zoom-out seems that my shapes move to the east. What could be ...
64 views

Change the content of Countries.txt

I'm following the steps on this page: "https://github.com/mapsme/omim/blob/master/docs/MAPS.md", "https://github.com/mapsme/omim/blob/master/docs/INSTALL.md" When I run this line "omim / tools / ...
48 views

Some labels not being generated on map contours

I'm trying to produce a map using the latest QGIS incarnation: 2.18.11 After importing the UK OS contour data for one 100km grid square, I crop it using two contiguous polygons (1km squares). Two of ...
95 views

Allow user to pan after once 'box' is draw in Openlayer2

I am using this example http://dev.openlayers.org/examples/draw-feature.html to draw a box on a map using 'draw box' checkbox option. Now I want , After drawing box I can be able to pan on map ...
123 views

Unable to pan on map on a specific zoom level . Openlayers2 [closed]

I am fixing bug of a big application, In which after I cant pan over map but after zoom in I can pan. after again zoom out Its impossible. As I mentioned its big application so I cant post all code ...
925 views

Updating OpenStreetMap maps database of own tile server?

I am working with a osm2pgsql database, and I do not know wheter I can use Osmupdate or not because in the StreetMapWiki it says furry-sansa should be used for osm2pgsql databases. The problem is ...
1k views

Check if a Polygon Feature is completely enclosed by another GeoJSON features in OpenLayers 4

I have a map which is implemented using Openlayers 4. It loads a GeoJSON vector which defines the boundaries of a particular country. The user is allowed to draw and edit polygons to define subregions ...
366 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 ...
642 views

I am trying to create management zones on selected fields in Greece, so I am looking for high-resolution layers (maps) to use as a base (preferably satellite imagery). Could you suggest me the best ...
18k views

Seeking offline map API like Google Maps for web? [closed]

I'm looking for an offline map API for web like Google maps (because I know I can't use this offline). I currently have a program (using js and node.js) that uses the google maps api and google roads ...
314 views

Obtain elevation from a request lat,long with a map .tif

I am trying to get the elevation between two points in a route of Spain using APIs with HTTP request. I am using OpenStreetMap to get the routes, but I don't know how extract elevation with other tool....
141 views

Does cropping and adding an alpha layer to a raster map yield better georeference results?

I have a collection of nine high-resolution map scans illustrating former borders between two nations. The scale is about 1:13,265 for each of the nine images. I want to georeference these maps using ...
731 views

Align Raster with boundary shapefile: selecting right proj4 R

library(maps) library(mapproj) library(mapdata) library(rgeos) library(maptools) library(sp) library(raster) library(rgdal) Drawing inspiration from here https://stackoverflow.com/questions/10763421/...
11k views

Keep customized colors with geom_polygon()

I have plotted a map of France with customized colors with map(): map(database="france", fill=TRUE, col=color) Results: (don't mind the two errors) and then I want to put this map with a ...
598 views

How to make proportional signs on QGIS?

I usually use the proportional circles extension of QGIS but I need to have proportional pork or pigs according to the number of pigs per exploitations (it's a map about agriculture). How do I do ...
263 views

Topographicmap.jpg convert to GPS readable [closed]

I have topographic map 1:25000 and I want that map to be GPS readable. So, is there any program for maps that can import this .jpg extension and to track my position in platform of this my topo map ? ...
6k views

Using one map, multiple layouts, each with different layers in ArcGIS Pro?

I was wondering whether it's possible in ArcGIS Pro to create multiple layouts for one map, which contains different layers (e.g. aerial photo, buildings and soiltype). After prepping the map in 'map ...
1k views

Map all time steps of a NetCDF file in R using a loop

I have a NetCDF containing temperature values over a certain region for 2011, with 1-hour intervals, so that means that I have 8760 maps. What I want to do, is plot all 8760 maps using one color ...
8k 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', ...
177 views

LonLat values returning from Openlayers 2

I have developed an app using Openlayers 2 to retrieve the latitude and longitude values based on the clicked position. The map display the area of Great Britain and Northern Ireland. Below the ...
45 views

Forming and Creating Town maps for Public Use [closed]

I have a keen interest in Graphics Design and have always wondered how town maps are created I assume it's a mixture of GIS and Photoshop/Illustrator. Anyone here of any experience producing these ...
8k views

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

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 ...
236 views

Changing temperature range in thermographic map using QGIS

I need to know how to set temperature range from thermographic map to be from 100-120° C using QGIS. In that case I would see just the temperatures from 100-120° C.
486 views

Authagraph world map with deformed south pole instead

Read this first: The north pole is deformed on AuthaGraph world map I am interested in an authagraph map, where the tip of the tetrahedron is orientated to the south pole instead, so the deformation ...
309 views

Muhammad al-Idrisi lake Victoria map 12th Century

Wikipedia and many other sources state along the lines of, "An excellent map, known as the Muhammad al-Idrisi map from the calligrapher (sic) who developed it and dated from the 1160s, clearly depicts ...
296 views

How to set zoom on the basis of the road in Google maps API?

I worked out a similarity Project a Google traffic, I would implement the same Google traffic visualization about the Data Traffic What a depending on the zoom level displays them or hides them. For ...
708 views

Leaflet - Leaflet.MarkerCluster.LayerSupport add/remove layers using external checkboxes?

I'm trying to implement the Leaflet.MarkerCluster.LayerSupport plugin following this example, however while it seems easy to add and remove data using buttons, there is nothing here to indicate one ...
4k views

Writing SpatialLines objects in R

I used the function landgenreport from the package popgenreport in R to create an object result. This object is a list with various objects including SpatialLines class objects. I am trying to write ...
38 views

Sheetsee optionsJSON problem

I am doing some basic work with G Sheets and Sheetsee.js library. I have it working as far as I get my coordinates showing up on a map. I'm using the demo-map file as my starter, I just changed the ...
149 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 ...
1k views

Offline map in desktop application [closed]

In a win form I am getting location(latitude and longitude) by serial port and want to show this location in map but in offline mode. What is the best way to do this? I have a device which is ...
52 views

GIS base map solutions [closed]

I'm new to GIS development, and am looking for a mapping solution for a web app. The map will be fairly complex with 4-5 different layers. I'm looking to convert shapefiles into a usable geo-coded ...
126 views

Wrong coordinates on an old map

I'm trying to learn how to work a bit with Qgis for a part of a university work, and I'm facing some difficulties with an old map, and setting it up with the right coordinates. I have some old maps ...
245 views

Austrian-hungarian map: Franzisco-Josephinische (3) Landesaufnahme - Legend

Currently I work with the Franzisco-Josephinische (3) Landesaufnahme (Austria-Hungary) map in area around Lake Neusiedel. There are some map sheets around Vienna with the scale of 1:12.500 In the ...
151 views

Customize map images in openlayers 3

I would like to set up my own custom map by changing the images in openlayers 3. Is something like this possible and how would I go about doing it?
417 views

How to add multiple stop points for routing using ArcGIS in Android

I have a project where in I have a source and a destination, but in between there can be any number of stop points. I need to display a route from source to destination covering all the stop points. ...
316 views

Pixel sizes, cartographic scales and maps

In spite of being a widely discussed topic, I have not been able to find the complete answer to my concerns regarding scale's use in maps preparation. I am interested in finding in the relationship(s) ...
420 views

How to split Indian states and provinces from world states and provinces shapefile?

I am following Mike Bostock's D3 Lets make a map to create GeoJSON for states and provinces of a country. I got a shapefile for states and provinces from Natural Earth. I am trying to extract info for ...
257 views

Converting a Map Scale

I need some guidance. I'm using an ESRI Base Map with Web Mercator projection(Wkid - 102110) in an web application using JavaScript. I'm trying to display the Map Scale as range on the map. I got the ...
9k views

Create map using Leaflet and JSON

I have a question in order to developing a web app using dynamic maps with JSON files. I'm using Visual Studio 2015 with MVC 5. At this moment i have developed complete app but I'm unable to draw ...
36 views

Get Coordinates

I have the following tif metada: Geotiff_Information: Version: 1 Key_Revision: 1.0 Tagged_Information: ModelTiepointTag (2,3): ...
465 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 ...