A map projection is any method of representing the surface of a sphere or other three-dimensional body on a plane

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How to realize Stereographic projection in openlayers 2?

I have my own tiles and 8 zoom pyramids levels, and now I want to realize stereographic projection by using openlayers 2, is it possible to make it without using other libraries(like proj4js)?
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4 views

How to load Tianditu(TileMap) by ArcGIS API for JavaScript 4.0 ? The Projection must be “4490”

How to load Tianditu(TileMap) by ArcGIS API for JavaScript 4.0 ? The Projection must be "4490". The url is"http://map.tianditu.com/map/index.html". Anyone can help me? I need to use the projection(...
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30 views

Reproject coordinates in order to correct them in QGIS

I got two type of coordinates(correct values and incorrects(15m error)), and i want to specify transformation parameters between them in QGIS. I thought that finding Helmert transformation parameter ...
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1answer
35 views

Converting polyline coordinates to lat/lon for use in google maps

I am given an ArcGIS polyline (or polypoint) from a WFS service (e.g. 1693669.5143, 5672605.5392), and am looking for a function (python, java, whatever) to convert it to a lat/lon so I can use it in ...
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21 views

What map projection has latitude as x axis and longitude as y axis? [closed]

I need it so when I travel 1 on the x axis anywhere, I will travel 1 longitude.
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19 views

how to project modis blue marble image?

I have combined MODIS blue marble images into a mosaic, a screen shot of the mosaic raster image with its source info opened in arcmap is attached. The file source shows that it has angular ...
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1answer
22 views

Are degree based length/area measures comparable across regions?

I have global shp files of basins (polygons) and rivers (lines). I wish to calculate a measure of stream length per basin area. It should be comparable across world regions, e.g. I wish to compare ...
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1answer
14 views

Extract lat long point values from EASE2 without reprojection

I have the following file: EASE2 and want to extract the values for this geographic location (148.1, -35.6) #lon lat. How can I do this without the need for reprojecting the ease grid file into ...
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1answer
35 views

Road snapping in R - snapPointsToLine / Projection Problem

1. Introduction (you may skip this if you like) In order to implement a road snapping feature in R for recorded positioning data, I first searched the internet for possible solutions to the problem: ...
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1answer
20 views

Appropriate projection for US distances?

I am generating distances between crash sites (points) and urban areas (shapes) and am wondering what the best projection is to use for this task. The area of interest is limited to the U.S. (Alaska ...
2
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1answer
40 views

How can the gridlines in QGIS be set to be curved lines (neat circles) around polar region (azimuthal projection)?

I am trying to present a map of our polar regions using QGIS software. I am using an azimuthal (polar) projection. I have added a graticule (gridlines) to the map as a background, which are at 10 ...
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1answer
30 views

Choosing map projections specifically for San Francisco Bay Area?

I am asking because I am not familiar with specific map projections for the San Francisco Bay Area.
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1answer
33 views

Clipping layer when using new projection in QGIS?

I'm having trouble clipping a shapefile in QGIS so I'll take you through my steps. I've downloaded the land shapefile here http://www.naturalearthdata.com/downloads/10m-physical-vectors/ When I load ...
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1answer
15 views

Calculating distances of lines in R

I drew some lines in a GIS application in this projection: +proj=longlat+ellps=WGS84 +datum=WGS84 - is there a name for this projection? I imported my lines into R and to prepare for calculating ...
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2answers
32 views

Transform Lat/Lon to LCC and vice versa

I need to convert lat/lon to meters as the unit of measurement to do some calculations. I found this online tool to transform my data from GEO_WGS84_Lat-Lon to LAMGe (LCC). This works for me but I ...
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1answer
28 views

Problem with MGI CRS on the Balkan

I have problem with CRS Bosnia and Herzegovina? MGI 1901 / Balkans zone 6 EPSG:3908 MGI 31276 / Balkans zone 6 EPSG:31276 Which of these two is OK? When I open google sattelite image with ...
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1answer
26 views

Unable to display Gauss Krüger- points

I have this list of sampling points and they told me to display them in ArcMap 10.3.1. This are Gauss Krüger coordinates of soil samples in Austria: From a table I use ->"Display XY data" and the ...
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19 views

Working with intersecting polar grids

I'm having some trouble figuring out the best way handle some GIS data. I want to analyze pollution from specific sites at specific points. I have a list of sites I'm interested in all across the ...
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1answer
40 views

Creating an Interrupted Map With OGR, Mapnik and PIL

I am trying to create a simple interrupted Sinusoidal map with Python using OGR, Mapnik and PIL. The general idea is: Make 6x 60 degree sinusoidal maps For each one, make a mask to make it gore ...
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1answer
41 views

Dymaxion/Butterfly alternative projection for QGIS

I've been reading the Dymaxion and Butterfly projections are not open source, so can not be used with QGIS. Are there alternatives to these available in QGIS? I'm looking for a single projection so ...
2
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0answers
27 views

Improving Trimble GPS Pathfinder Office and TerraSync coordinate systems workflow?

We have GPS survey projects all over the country (CONUS and OCONUS) and I am wondering what the best practice is for having to deal with multiple coordinate systems. I can go from WGS84 UTM 18N meters ...
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3answers
53 views

South-up projection/setting in QGIS

Is there a south-up setting for a projection in QGIS?
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1answer
30 views

Gall-Peters or other cylindric equal-area projections in QGIS?

Is it possible to use Gall-Peters or other cylindric equal-area projections like Hobo–Dyer in QGIS?
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47 views

Openlayer3: projection to Map.view coordinate system

I have an ol.layer.Tile with ol.source.BingMaps in epsg:3857 and I want add it to my ol.Map with projection 4258. The code below does that but when I display the layer it is rendered in the original ...
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1answer
25 views

Difference between MODIS sinusoidal and integerized sinusoidal grid

What are the differences between the MODIS sinusoidal and MODIS integerized sinusoidal grid? The sinusoidal grid seems to be currently used, whereas the integerized sinusoidal grid is marked obsolete (...
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45 views

Projection conversion issues; Philippines to OSM

I am working with some roads and bus routes data in Philippines. The bus routes data is in Philippines Zone 4: ESPG 3124 projection. I am trying to match it to roads data to generate stops at ...
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2answers
53 views

projection from epsg:4326 to epsg:4258

I'm looking for projection functions to convert coordinates in 4326 to coordinates in 4258 and viceversa. Any suggestions?
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2answers
64 views

Mistake in Calculating Area or a Bug in QGIS? [duplicate]

I am trying to calculate the area of a polygon following the step by step mentioned in all the questions related to this issues in this website. Nonetheless, the result of the area calculation is ...
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1answer
26 views

Los Angeles county aerial imagery

I am looking for a basemap of LA county showing aerial imagery similar to google earth. However, I also need it in a specific projection: NAD_1983_StatePlane_California_V_FIPS_0405_Feet. Does anyone ...
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0answers
41 views

Aligning layers in QGIS?

I am new at QGIS and am having a problem aligning layers. Possibly I just don't understand how projection works. I have 2 layers: 1) GPS waypoints collected in a GPS UTM zone 55N 2) polygon ...
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15 views

Requesting Mongodb collection with 2dsphere index from Leaflet LatLng

I am using projection and 2dsphere index. Similar posts have been done on mongodb support site but it may be a pure GIS problem,so here I am ^^. My scenario is the following : I create a Point/...
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2answers
74 views

What is wrong with my projection

I am using OpenLayers to plot a point on a map; the point should be located in the UK; but keeps appearing in the middle of the ocean (0,0). I have check my projection and I think this is correct. ...
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1answer
20 views

CRS different after r.reclass through QGIS different than source raster

According to the properties, my output raster is in a different projection than the input after running GRASS r.reclass through QGIS. Does anyone know if this is just a fluke and I can simply select a ...
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1answer
18 views

CRS USA_Contiguous_Albers_Equal not working

I have selected the USA_Contiguous_Albers_Equal_Area_Conic, yet the map is showing a different projection. It worked when I started the project and something went wrong after I did a "print composer"....
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1answer
63 views

Don't understand error : Error in if (nchar(projargs) == 0) projargs <- as.character(NA) :

When I run two different scripts from examples (which seem to work where I took them from) I get an error in both cases. Something seems to be wrong in my general set up or something. But I have no ...
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1answer
34 views

Configuring Project CRS to reflect degree coordinates

seems like this is a common problem, but posts with similiar questions did not solve my problem. I have close to zero GIS background so apologies for my ignorance. My goal is to extract only a ...
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1answer
61 views

How to tranform MODIS tiles into lat/long?

I'm trying to get the vegetation index nearest to a particular lat/long. I'm getting the data from here which is 250-meter spatial resolution hdf file. The globally gridded projection is split in 36 (...
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1answer
38 views

What SRS does leaflet use when it creates new markers?

I'm using leaflet 0.7. I'm wondering what spatial reference system is used when a new marker is created? Also, how does this impact my use of maps? (I'm using leaflet .7 because of dependency ...
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1answer
34 views

Projections leaflet and OSM

I downloaded data from OSM and extract lat/lng coordinates from a user who is clicking on a leaflet map. So my program returns the coordinates where a user clicked! I am wondering what crs I need to ...
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1answer
18 views

ENVI Changes the Projection of the output

After I have finished my Object-Oriented Classification, I open my result in ArcMap and I see that ENVI changed my Projection. Now the images are really in different places.
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46 views

Grib file information to create QGIS projection

I'm trying to create a specific projection with QGIS (something like that: +proj=lcc +lat_1=69.75 +lat_2=52.87 +lat_0=61.31 +lon_0=7.665 +x_0=0 +y_0=720 +ellps=GRS80 +units=m +no_defs). I have some ...
3
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1answer
52 views

Differences in the longitude and latitude between a LiDAR DSM and an optical image

I've downloaded the UK's LiDAR elevation data (see below) in laz format for a specific region (Tewkesbury) from: http://environment.data.gov.uk/ds/survey#/download From that, a DSM (Digital Surface ...
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1answer
41 views

How to interpret cell size arcgis

I have a raster layer that has cell size(x, y) 0.008928, 0.008928. I download it from the website as 1km resolution data under WGS_84. I can not find the unit for these numbers in the metadata. Is ...
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20 views

How to resolve issue with model output in degrees and ASCII format cell size in meters when converting to a raster?

I am new to using Arc. I have data from a model output where each grid cell is 1/16 of a degree resolution. I have put the data into ASCII text format, however the header for ASCII under "cell size" ...
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1answer
32 views

Getting LonLat of a specific location in a specific projection on osm / google maps?

How can I get the coordinates in, for example EPSG:4326 of a specific location, in either OpenStreetMaps or Google Maps?
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2answers
53 views

Plot x,y coordinates on a Polyconic Map Projection

I have an image of a large polyconic map projection: (Note that the actual image is much larger, I just made it smaller to upload it.) I would like to take in a user's GPS coordinates and plot where ...
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14 views

How to retrieve geodetic coordinates from a geotiff in Javascript?

I believe I have successfully calculated UV space coordinates by following this formula: var size = [image.getHeight(), image.getWidth()]; var xScale = directory....
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28 views

Soviet Maps projection

What was the projection used for the Soviet Topographic Maps? http://maps.vlasenko.net/smtm50/k-37-072-1.jpg i am trying to georeference a map from Georgia. I believe the projection used was GK (3 ...
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11 views

Trouble Correctly Projecting from ETRS to UTM

Task is to project a DEM from ETRS_1989_UTM_Zone_30N to WGS 84 / UTM zone 29N. Easy enough right? Process succeeds, but inaccurately. I have recently read on this ESRI Geonet post that ArcDesktop ...
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12 views

Raster Layer doesn't display, TileMill

I'm attempting to add a raster layer to TileMill, but for some reason the raster doesn't seem to be reading in correctly. I used gdalwarp to reproject the raster file to EPSG:3857 and then import it, ...