# Tagged Questions

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.

41 views

### Calculation of coordinates

How can I merge some small regions to create big regions? Then how would I be able to calculate the coordinates of these new regions?
23 views

### SRIDs do not match for the two geometries in oracle spatial

I am trying to resolve where some points from Point Geometry lying outside the Polygon geometry. I want to filter those points which are lying outside the polygon geometry. I am getting error where ...
43 views

### QGIS Lat/Long Postcodes Coordinates Being Placed Out At Sea?

I've read plenty of posts on this site regarding coordinate systems but none of them have helped solve this issue. I'm using Ordinance Survey Lat/Long coordinates for postcodes but a small number are ...
42 views

### Conversion of projection

I have received a drawing with a type of projection system which I do not recognize. The drawing says that it's LO 19/WGS 84. I would like to convert this to decimal degrees to be able to plot the ...
25 views

### Get Coordinates

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

### Coordinate System Mismatch

I understand that coordinate system mismatches between layers is a relatively common problem. Nevertheless, exploring other posts hasn't helped me understand my issue. In short, I have a DEM raster ...
70 views

### How to convert from a local coordinate system to UTM (and vice versa) using mathematical expression

I have two coordinate systems- UTM Zone 23S and a local one with the following conversion from UTM to Local: EASTING: SQRT( (UTM_EAST-296787.355)^2 +UTM_NORTH-8095123.271)^2) *COS(ATAN((...
45 views

### Creating Proj4 string for local coordinates

I am fairly new to coordinate system conversion, so am rather lost on the following problem. We have been using Proj4 to convert between various coordinate systems which is fine for known coordinate ...
31 views

### R: Krovak projection in R - identical in ArcGIS, different in R?

I have two files: shapefile and raster, both in the same coordinate system in ArcGIS: EPSG 5514. Check information on projection in ArcGIS for raster: S-JTSK_Krovak_East_North WKID: 5514 Authority: ...
6 views

### How do I display NAD 1927 Albers with other data?

I have some raster datasets which are in NAD 1927 Albers projection. I cannot seem to display any other type of data with this projection. I get the pop-up projection warning when trying to add a ...
22 views

### Trying to import Tiff files created in arc9.3 into 10.2, not working

I'm trying to use the scanned maps available here: http://www.env.gov.bc.ca/esd/distdata/ecosystems/TEI_Scanned_Maps/B01/B01-4700/ I save all 6 files in a folder, open ArcGIS 10.2 and try to add to ...
17 views

### How can I change the name of a coordinate system in SAFE FME?

Every time I use SAFE FME to write data in the coordinate system EPSG:25832 FME names it NUTM32. I them have problems reading the data in ArcGIS Desktop because it doesn´t recognise the name NUTM32. ...
30 views

### Shape File CRS Conundrum

In QGIS I have 2 Shape vector layer files which should overlay approximately one on the other. They have both been downloaded from the same government website (data.vic.gov.au) with the same ...
98 views

### Krovak projection EPSG 5514: Correct data transfer between R and ArcGIS?

I have a problem which many ArcGIS, QGIS and R users from Czech Republic and Slovakia may encounter. In ArcGIS, I am working EPSG: 5514, Projected Coordinate System, defined as: S-...
26 views

### Extracting projection details for TAB files from multiple folders using arcpy's describe spatial reference?

I am trying to extract projection details of vector files (it might be a tab or shp file) in multiple subfolders using arcpy's describe.SpatialReference. If i run this code, i am getting this error. I'...
25 views

### Which PCS to use with WGS 1984 datum? [closed]

I am working on building a Modelbuilder tool to convert a .csv file with lat/long values into a polyline with shape_length. The dataset is in the WGS 1984 datum. It is my understanding that this must ...
103 views

### Change the actual coordinates in a shapefile (QGIS)

I'm trying to map data for a county in Texas. The data were provided to me in a shapefile, and I've been working with it in QGIS 2.14. My problem is this: The coordinates in the shapefile I was given ...
29 views

### How is Reprojection done in QGIS [duplicate]

am using QGIS 2.14.1: How i Reproject a point dataset i have into a different format? eg. wgs84 to local system Am New to QGIS, Switching from ArcGIS to QGIS
31 views

### Default transformation for a EPSG CRS

Is there any way to know which transformation, from available, is the default transformation for a CRS in the EPSG database? For example, EPSG:4230 has more than 30 transformation available and ...
25 views

### How is distance measured in TIGER/Line data for roads?

So I'm working with some TIGER data for network analysis, and it comes with no speed or time attributes, so I was able to assign average speeds to the various road types, and I was going to use field ...
28 views

### What CRS to use when creating buffer all over the world in QGIS

I trying to create buffers (50km) around many points all over the world (airport locations) in QGIS. I will then overlay these buffers with a world-wide raster dataset so I can extract information ...
25 views

### How do you line up a pre-existing public domain map with csv coordinate points on QGIS?

I have been struggling with this simple problem all day. I found a Florida map with the counties on Google for GIS. I uploaded the map to QGIS with no problem. However, whenever I try to upload points ...
23 views

### Reprojection script failing after running once

This is related to Getting Error 999999 from arcpy.SpatialReference.name? @Aaron gave me a workable solution. I refactored the script afterwards and it ran once successfully. When I reran it in the ...
56 views

### How to get appropriate CRS for a position specified in lat/lon coordinates?

I have a set of city networks whose coordinates are specified in lat/lons. I wish to run an algorithm on each network that treats them as a planar graph. I'm using python and can use pyproj to project ...
89 views

### Getting Error 999999 from arcpy.SpatialReference.name?

I'm trying to build a set that consists of spatial reference names using .name method from the arcpy.SpatialRefernce() class. When I do this for a single prj file there is no issue, but when I try to ...
33 views

### 6 degree of freedom helmert transformation

I'm looking to do datum conversions for points with six degrees of freedom, that is, they are described by a heading, pitch, and roll in addition to their position information. I know how to convert ...
20 views

### StreamingRenderer

I have a problem in my code (Java Geotools). When I draw in my carte map a LineString sometimes when I run my program an errors apears and I don't understand what does it means. Error: avr. 14, ...
65 views

### Identifying coordinate system?

I'm wanting to create a data layer using some open crime data from Salt Lake City, but I can't figure out the coordinate system they are using. See the link below to view the data. (You'll have to ...
35 views

### gdaltransform returns ERROR 1: failed to load datum shift file

I'm trying to do a NAVD88 to WGS84 (G1674) conversion using gdal. I've installed gdal (on centos7) using sudo yum install gdal proj-epsg proj-nad and am trying to perform the conversion via: ...
39 views

### VDatum helmert transform parameters

I'm trying to use NOAA's VDatum to verify the NAVD88 -> WGS84 datum conversion in a c++ datum conversion library that I've written. The answers didn't agree, so I attempted to check a simple ITRF2008 ...
52 views

### csv - CRS undefined, QGIS

I wonder why some csv files when imported (with long and lat) can not set a proper CRS system and other do (CRS undefined). For example: 1) if I export my data in csv with Microsoft Excel it does not ...
61 views

### How to correct ArcMap re-projection

In ArcMap, I add a layer from ArcGIS web server projected in "Bessel 1841 Transverse Mercator". Then I add new layer as a base map from ArcGIS online web server. This is the result: Shift is ...
107 views

### How can i convert the coordinates (latitude,longitude) to X,Y using postgis

I want know how i can convert the latitude and the longitude coordinates of a rectangle in the Cartesian coordinates, so I can store them in a geometry field using postgis.
86 views

### Finding Wgs84 coordinate from ascii grid and calculating scale over a slippy tile map?

I am currently trying to calculate the wgs84 coordinate from an ESRI ascii grid file, which the xllCorner and yllCorner coordinates are I believe in Cartesian coordinates, here is a sample of the data'...
27 views

### Can typical Meets and Bounds (angles and distances) drawings be accurate in QGIS?

I’ve been working with parcel boundary shape files (.shp), standard satellite imagery, and Meets and Bounds (angles and distances) site maps / legal descriptions for a few weeks. Wondering if those ...
32 views

### Deciphering coord. ref. in R – very basic question

I'm trying to make sense of the coord. ref. parameters for rasters in R. For example, for a given raster, crs() gives the following: +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0 ...
36 views

### Do outputs (shp, dwg) inherit vertical datum from input (las) files?

I'm working in ArcMap. I pulled LiDAR data off earth explorer and created a DEM with the LiDAR data. I then created contours as a SHP file and exported to DWG (CAD). I was asked if the CAD file's ...
28 views

### how to calculate area if it is falling in two utm zones [duplicate]

I am using ArcGIS 10.1. How do I calculate an accurate area measure for a polygon, where portions of it are falling in two zones, i.e. UTM ZONE 44 & 45 (India)?
26 views

### Converted a USA Contiguous Lambert Conformal Conic vector shape to WGS 84 EPSG 4326 and dimensions changed ~20%

Needed geometric tools to draw lots of parallel lines representing flight paths for taking overlapping aerial pictures - Lambert Conformal Conic was ideal (I thought). But saving to my project's ...
27 views

### Change CRS, but the image position also changing

I have 2 overlapped image, one is an aerial photo in CRS EPSG (4326) WGS 84, and one is a satellite image, in CRS EPSG:32648 WGS 84/UTM zone 48N. I need to georeference the aerial photo compare to ...
56 views

### How to instantiate a new map with proj4leaflet projections from a Bootstrap dropdown menu

I'm currently working on a Leaflet website that will be able to display GPS-Tracks with different projections. Now I'm trying to implement a dropdown menu based on Bootstrap, where I can set different ...
42 views

### Calculating Area for data in WGS 84 using ArcGIS for Desktop? [duplicate]

I am using ArcGIS 10.1.1 for Desktop on my laptop. When I try to calculate the area in WGS 1984 the area is disabled. If I work in one projection, say WGS 1984, and calculate area in another ...
64 views

### Reprojecting raster from one CRS to another?

I have a .tif raster file which is based on some projected coordinate system (for example: NAD 1983 State Plane California). I would like to export this raster as a .xyz file, but also reprojecting it ...
56 views

### projected coordinate system and transformation

I'm a beginner with GIS and I'm currently working on ArcGIS 10.3. I have two distinct shapfiles : one within the projected coordinate system "NTF_Paris_Lambert_Sud_France" and the second one within "...
27 views

### Shape files are not lining up [duplicate]

I have two shapefiles, with the same projection but they can not overlay. I understand that the extent is different, but i can not figure out how to change it? Here are the tow layers properties :
76 views

### How to find a datasets spatial reference and apply it to another dataset?

I'm struggling to use the describe function to find the spatial reference of a given shapefile and then apply it to another shapefile which has been copied to a projected folder. I'm relatively new ...
40 views

### I want to have two raster data sets overlay

I am using ArcGIS 10.3 I have 2 raster datasets with different coordinate systems, but they are the same county (just different databases). When I add them to the same map layer they are far away ...
106 views

### How to create a QGIS map of unprojected data?

I am attempting to display data generated by Ubisense technology. The data contains non-geographic x y coordinates. I would like to load this data into a QGIS project to perform analysis. Is it ...