A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.

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1answer
72 views

Project a set of coordinates - points from an excel into a shape file with unknown coordinate system (map-match)

I am trying to project a set of coordinates (points) from an Excel spreadsheet, on top of a shapefile (map) with an unknown coordinate system. The Excel file was created by first creating a map with ...
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0answers
41 views

Distance Measure appears to be wrong in ArcGIS Desktop?

The distances in my shapefile are completely wrong. I got this shapefile online. Does anyone knows what's going on? I attached two pictures. The shapefile is projected as ...
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2answers
110 views

Setting coordinate system for image in ArcMap?

I am a beginner with ArcMap. I have a problem with setting coordinate system for my image. I am using an add-in which creates shapefiles .shp (craters, area), grids, plots and etc. However I get ...
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1answer
30 views

Difference between GCS_European_1950 and GCS_International_1924

In ArcGIS, there are two datums they look like same except their names; GCS_European_1950 and GCS_International_1924. Where I started to work, I found out that they are using both datums. Since they ...
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3answers
92 views

What's the difference between EPSG:4326 and EPSG:36232?

I do not understand what these different EPSG's mean, even though they are both under WGS84. The way the latitude and longitude values displayed are different in both the cases when I try to change ...
4
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2answers
221 views

Difference between latitude and longitude

It occurred to me that latitude and longitude are not homologous in that the lines of latitude lie on parallel planes or slices through Earth, while lines of longitude are not parallel and meet at the ...
3
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1answer
41 views

Exporting BNG coordinates from MapInfo (27700) without rounding

I have a TAB file in ESPG 27700 projection and MapInfo is rounding Y coordinate values upon export. It also occurs when viewing the table (although selecting the value shows its 'true' form) Upon ...
1
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1answer
80 views

How to convert GDA eastings/northings to WGS84 lat/long in QGIS

I'm using QGIS to map weed locations and have a mixture of data from GPS, shape files of contours, OSM all in a project with CRS WGS84 (lat, long). I am trying to add in a shape file I have been given ...
3
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1answer
76 views

How to convert Chinese Beijing 1954 coordinates to WGS84

I have a series of coordinates for locations in Sichuan Province China that I need to convert so that I can use them in Google Earth. The coordinates are "1954 Beijing coordinates system" and show up ...
4
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1answer
58 views

Changing the projection transformation for a feature class after adding it to an mxd

Is there a way to select a different projection transformation after you've added a feature class to an mxd? I have a pretty complex mxd set up to use as a map service where the original data is in ...
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0answers
32 views

Rototranslation + scale of pdf and dxf with USER CRS in QGIS? [duplicate]

i have a map PDF or DXF to georeferenced with only rototranslation + scaling. I use EPSG: 32632, also the map that I need to import is a survey (maxmimal dimension 5000 m x 5000 m), but his coordinate ...
2
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1answer
28 views

How to interpret BUFR descriptors

I'm processing BUFR products from Eumetsat and I would like to ask for your help about the following descriptors: 002028 SEGMENT SIZE AT NADIR IN X DIRECTION 002029 SEGMENT SIZE AT NADIR IN Y ...
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1answer
76 views

If Geographic Coordinates are unprojected coordinates, how can GIS softwares display such unprojected data on a plane?

I have been using ArcGIS and QGIS regularly for about 2 years now, and just recently I was struck by this new thought. If a data set in say, in ArcMap, has been georeferrenced with a Geographic ...
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0answers
44 views

Satellite Image of same projection system , do not overlap

I have two satellite imagery with same projection system i.e. QND_1995_Qatara_National_Grid as Spatial Reference and D_QND_1995 as Datum. Satellite Image A) Received in WGS84 and converted it to ...
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1answer
73 views

How to get projection data (.prj) of raster image using GDAL/OGR?

I start with a boundary shape-file (think U.S. states) in lat/long that I convert to some projection, and then rasterize the result as a .tif. What I need now are the raster coordinates of the ...
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0answers
125 views

Converting coordinate notation from GDA94 to WGS84 gives ERROR 999999?

I am trying to convert my data from GDA_1994 to WGS_1984 using the 'Convert Coordinate Notation' tool from ArcToolbox. I used the import XY data tool to import my csv file with x,y fields (among a ...
3
votes
1answer
96 views

Using Cassini-Soldner projection in QGIS?

I have a shapefile in a Cassini Soldner reference system centered in Monte Mario (Italian cadastre map). I want to insert these data inside QGIS in order to compare data with aerial images. When ...
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0answers
22 views

ISO 3166-1 + ISO 3166-2 data plus lat long border data

Could anyone please be so kind and point out a commercial/reliable source of up to date ISO 3166-1 + ISO 3166-2 data plus lat long border data?
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0answers
33 views

How to extract the raster files from .prj?

I am interested in using Raster Calculator tool for which i need the desired raster files. But i came across a problem i.e. when i converted my vector files to raster and saved them they were saved ...
0
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1answer
111 views

What's the formula for converting SWEREF99 to WGS84

I have a few hundred rows of data with sweref99 coordinates that I want to plot using Fusion Tables on Google Drive. What formula can I use to convert the two columns of Sweref99 x and y coordinates? ...
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0answers
102 views

Trying to convert GPS LatLng Android coordinates to use in ArcGIS rest - esriMeters

I am getting the LAT and LNG position from Android. Both values are of type double, in Degrees. For example: NY, USA Latitude: 40.7142700 Longitude: -74.0059700 Then I have a service ArcGIS REST. It ...
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1answer
66 views

Difference between WGS_1984_UTM_33N and GCS_WGS_84

What is the difference between: a map that has a projected coordinate system of WGS_1984_UTM_33N, a geographic coordinate system of GCS_WGS_1984, and a datum of D_WGS_1984 a map that has no ...
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0answers
11 views

Missing importfromURN method in gdal java wrapper

The java wrapper of gdal doesn't have the method importFromURN, and I want to use the projection system which is specified in the URN string format. Is there a way in which I can do that? Maybe I can ...
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0answers
27 views

ArcGIS Online no spatial reference

My intention is to georeference an image so as to create a Swipe Map in AGOL. First, I add my control points, rectify, then analyze before attempting to share and finally publish in AGOL. The other ...
2
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1answer
240 views

Convert coordinates to differnt Spatial Reference System in Python

I am trying to convert co-ordinates (-33.75, 150) from epsg:3857 to epsg:28356 in Python. Using both of the examples in post How to convert projected coordinates to lat/lon using Python?, I get the ...
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1answer
86 views

How to project WGS84 to Kertau RSO in ArcGIS Android

How do I make a conversion from WGS84 (longitude, latitude) to Kertau RSO using ArcGIS Android? I looking into this for my project. Am I looking at the correct direction? I have following points in ...
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2answers
116 views

How to overlay a Lat/Long CSV and NAD83 Shapefile in QGIS?

For reference I am new (as in a few hours of messing around) to GIS. I have a shape file/accompany projection files ect: CURRENT.prj CURRENT.shx CURRENT.shp CURRENT.dbf CURRENT.sbx CURRENT.sbn I ...
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0answers
43 views

Are there any conditions that could break the creation of an arcpy.Polygon object?

I have a script that generates a mesh network from vertex and centroid inputs, and it works for almost all my points. But for some records that get created in the feature class via the script, their ...
3
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1answer
57 views

How to manually add spatial reference information for FEWS rainfall data in ArcMap?

I am trying to match rainfall data from USGS/FEWS to coordinate locations of survey households in Uganda, so I will need to be able to project the rainfall data. So far, I downloaded the dekadal RFE ...
2
votes
2answers
73 views

Display a WFS service with OpenLayers 3. Define an add custom projection

I am new in OpenLayers 3. I am working with GeoServer 2.6.2 and I would like to create a web mapping with OpenLayers 3. I am working with a custom projection from El Salvador (Central America). It is ...
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1answer
54 views

Why did my data points shift position?

Here is an example of my issue: There are two point layers displayed in this image: The yellow dots are my currently used layer with the most updated data. The green dots are legacy data from when ...
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1answer
68 views

Shapefile doesn't fit in CartoDB basemap

When I import some shapefiles in CartoDB they don't fit properly at street level, as you can see in the screenshot. In this case, the shp was generated in QGis with CRS EPSG:29193 - SAD69. I have ...
3
votes
1answer
74 views

Local Ortho projection to Proj4

We are trying to use proj4 to project a local coordinate system to EPSG4326. We believe we have most of the string created correctly in QGIS and as follows; +proj=ortho +datum=WGS84 ...
6
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2answers
251 views

QGIS area calculation differs when on the fly CRS transformation enabled

When I open QGIS, add the layer, and calculate the areas of the shapefile via field calculator I get a different area than when I open QGIS and check "Enable on the fly CRS transformation" and ...
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0answers
45 views

Identify coordinate system used near Kuala Lampur

I have some coordinates that were given to me, and I do not know much about how they were taken. I thought they were UTM coordinates, but when I try to convert them using some online tools I always ...
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1answer
57 views

Conversion of (lat, lon, height) from GPS to another CRS

I have latitudes, longitudes and ellipsoidal heights derived from GPS readings, referenced to the ITRF08 system with vertical datum (CGVD2013) - http://webapp.geod.nrcan.gc.ca/geod/hmod/hmod.php How ...
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1answer
31 views

Geosoft Oasis Montaj Local Datum Transform - What is the purpose of this parameter?

When defining a coordinate system in Oasis Montaj one of the parameters is "Local Datum Transform". Is this the coordinate transformation definition to convert the defined coordinate system of a data ...
1
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1answer
128 views

How to upload GeoJSON to CartoDB in a CRS that is not lat/lon?

I'm pretty sure I need to convert the coordinates in my GeoJson file to EPSG:3857 for them to play nicely with CartoDB, but I don't know what coordinate system they are currently in. The original data ...
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2answers
93 views

Plotting points using coordinates from excel [duplicate]

I have an excel spreadsheet with co-ordinates (eg. S31 07 35.3). I would like to use these co-ordinates in arcmap (version 10.2) to plot points based on these coordinates. How do I go about doing this ...
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1answer
32 views

Change Projection

I am a little bit lost here. working in QGis 2.8, OS X 10.10. I have a polygon shp in the CRS EPSG: 21781, CH1903 / LV03 and a point file in EPSG: 4326, WGS84 How would I work with these ...
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1answer
50 views

Unable to export Projected layer [UTM] to Google Earth from ArcGIS for Desktop?

When tried to export any vector layer in ArcGIS [projected in UTM] to Google Earth, it is falling away from the actual location. However, when I export vector layer in Geographical Coordinate System ...
3
votes
1answer
110 views

Obtaining length of non projected feature (gcs_wgs_84) in meters instead of decimal degrees?

I could not find a post which answered to my problem and I hope I didn't miss it, in case I did I apologize. I'm working with Arcgis 10 and I have a multiple lines feature with gcs_wgs_1984 ...
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0answers
38 views

How to get changed spatial reference of any layer in ArcMap using ArcObjects?

I have several layers in arcmap. I can access these layer's spatial references too. But if user changed one of spatial reference properties(eg. name, central_meridian etc.)of any layer, then how can I ...
0
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1answer
73 views

Real-world dimensions of a 3D object in VisualSFM or MeshLab

I have a good-quality, precise 3D scene reconstructed from photographs/video by VisualSFM. All camera parameters, including 3D position and lens details, are known. Now, that the hardest work has ...
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1answer
56 views

Measuring areas in WGS 84 [duplicate]

I started a QGis project with adding information layers from OpenStreetMap such as the streets and railways for a city. This data has WGS 84 CRS. After that, I made a shapefile with urbanized bodies ...
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45 views

ESRI/Mapinfo MGA56 prj vs QGIS MGA56 prj

I am trying to understand why the degree unit is different between ESRI/Mapinfo and QGIS: ESRI/Mapinfo ...
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1answer
38 views

How to know spatial references of two layers are same?

I have two layers . Now I want to say that the spatial references of these layers are same or not .. I am using .Net technologies in arcmap. I have successfully got spatial reference information ...
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3answers
72 views

Project only required shapefiles in folder

I have 8 shapefiles in a folder with shapefile 1 and 8 in the same projection and the others (shapefile 2-7) if different projections. Is there a way to use python to use shapefile 1 as the ...
1
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1answer
74 views

Georeferencing Old Mining Maps (Floetzkarte des Oberschlesische) in QGIS?

I am trying to georeference some old mining maps (Floetzkarte des Oberschlesische) in QGIS 2.9. I have already tried to do that by marking known points on present satelite photos, but the results were ...
0
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1answer
64 views

Convert WGS-84 position into lat/lng

I am using leafletjs. I have a list of "WGS-84" positions that look like: LATITUDE N45 52.1096 LONGITUDE W125 52.4665 LATITUDE N48 24.1051 LONGITUDE E174 37.3832 What is the significance of the ...