North American Datum of 1983, a geocentric datum and geographic coordinate system based on the 1980 Geodetic Reference System ellipsoid (GRS80).

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### Converting between wgs84 and nad83

This is a newbie question that is about converting between wgs84 and nad83. I have aerial photos that I am trying to compute lat long coordinates for as closely as possible. There are several factors ...
5k views

### Is re-projection needed from SRID 4326 (WGS 84) to 4269 (NAD 83)SRID

I have US census data against state boundaries stored as SRID 4269, in an MSSQL DB. The input data used for calculations against that dataset is stored as SRID 4326. As far as I can infer from the ...
6k views

### Difference between datum and ellipsoid for geodetic coordinates?

Looking at the Wikipedia page for the North American Datum, it seems to imply that the datum is completely defined by the ellipsoid, which defines the major/semi-major axes, flattening, etc. For ...
784 views

### Is a Helmert transform necessary to convert between WGS84 and NAD83?

I've read things all over the internet which claim that NAD83 and WGS84 are effectively equivalent (with minor ellipsoid differences). However, if I do geodetic (WGS84) -> ECEF -> geodetic (NAD83) ...
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I have done a ton of research on the most accurate transformation to use in mainland Alaska to convert between the NAD83 and WGS84 datums, but I just can't seem to find a definitive answer. ArcMap ...
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I have data in NAD 1983 Zone 20 and want to transform it to NAD 1983 CSRS Zone 20. I found this source: https://community.esri.com/thread/6772 which states: NAD_1983_To_NAD_1983_CSRS_4 > 1950 ...
544 views

### When is data created in datums other than WGS84?

I'm trying to understand why we need datums other than WGS84. Since GPS coordinates are relative to the WGS84 ellipsoid what is the advantage of having other datums like for example NAD83. I ...
758 views

### Conversion from WGS84 to UTM NAD83

If all my data is in UTM NAD83 Zone 10 and I get new data in GCS WGS 1984 do I have to reproject the WGS data to UTM NAD83 Zone 10 for it to align correctly or can I just bring it into an mxd that is ...
243 views

### Which Custom Geographic Transformation Method to use for Nad83 to Nad 83 (CSRS)

I couldn't find a NTv2 file for transforming GCS NAD83 to GCS NAD83(CSRS) so I'm trying to create a custom transformation using the 'Create Custom Geographic Transformation' tool in ArcMap. The tool ...
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### Export DXF Issue in QGIS?

I got the shapefiles in QGIS and transformed them to UTM NAD83 from WGS84, then tried to create a DXF of it so I could use it as an overlay in fieldgenius software for a topographic survey we're ...
90 views

### Procedure of transforming coordinates?

I'm trying to understand the math behind this transformation. I should note that I've been able to perform the transformation using GeoPandas, but I'd like to understand what is going on under the ...
159 views

### Plotting NAD83 zone 8 points atop OSM or Fusion Tables

A geologist has given me a bunch of points to plot on a map I'm doing in WGS84. Her points are in NAD83, and she says they're in "zone 8." Here is one of the points. 440244 7599457 She says the ...
1k views

### Performing QGIS Datum Transformation from WGS 1984 to NAD 1983?

Is there a way to transform a shapefile's datum from WGS 1984 to NAD 1983 in QGIS 2.18.0? In the picture I have attached, the green dots are points that were collected in the field using a Trimble ...
721 views

### Coordinate System Mismatch in QGIS?

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 ...
11k views

### Convert PLSS (Section, Township, Range, Meridian) to Latitude and Longitude using R package or Python

I have data in the form of Section, Township, Range and meridian. I have 300,000 data points from all over the USA. Is there any way i can write R or python scripts to batch convert all the points to ...
146 views

### In ArcGIS can a feature set use multiple coordinate systems?

I'm new to learning GIS and ArcMap, but have some confusion about coordinate systems. I thought I understood that there are two main types of coordinate systems, Projected Coordinate Systems which ...
135 views

### Reprojecting points in NAD 1983 to LLA (WGS84)?

I've read documentation about using NAD_1983_To_WGS_1984_1 for the entire North American continent or NAD_1983_To_WGS_1984_5 for the 48 contiguous United States but what I'm confused is how can I use ...
170 views

### Converting between two NAD83 Datums

I have Layer 1, which uses the NAD1983 datum (GCS_North_American_1983). I'm trying to add Layer 2, which uses the 1983-2011 datum (GCS_NAD_1983_2011). I assume I have to transform the GCS somehow, ...
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### Converting NAD 83 State Plane Maryland Feet Coordinates from lat/long and vice versa using QGIS?

I need to convert a list of lat/lon points (in.csv file) into NAD 83 State Plane Maryland Feet and vice versa. I know it can be done using ArcGIS, but I only have QGIS. I am also quite new to QGIS....
672 views

### Convert 2D coordinates from NAD83 to WGS84 using Postgis

I have a set of NAD83 coordinates that I need to convert to WGS84 coordinates. I am using postgis on an RDS. Specs for the box I am using from postgis_full_version(): POSTGIS="2.1.3 r12547" GEOS="3.4....
615 views

### Shifting a CAD file from ATS77 MTM 5 to NAD83 CSRS UTM 20

Looking to make the coordinate system shift in ArcMAP (for Nova Scotia) between ATS77 MTM 5 and NAD83 CSRS...NTv2 file?
183 views

### Aligning layers with questionable metadata in SW Ontario

After making my best efforts to read/try everything I can on this forum and elsewhere, I unfortunately have to contribute to the wide literature of "my layers aren't aligning" questions. I am working ...
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### Why are there differences in output position between the ArcGIS versus NCAT transformation [NAD83 to NAD83 HARN]?

My question is specifically referencing the file-based grid transformation methods that are now available in ArcGIS. I thought this grid-file method was exactly the same method that NGS's NCAT used ...
673 views

### ATS77 MTM 5 to NAD83 CSRS UTM 20N Coordinate Converter?

I've been looking for a simple way to check the accuracy of my transformation using a set of coordinates for a single point but have been unable to find an online tool or piece of desktop software ...
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### PostGIS is rejecting an srid code for my projection. I've found a nearly identical projection w/ a legit srid. Will it work?

My projection is this: NAD 1983 StatePlane North Carolina FIPS 3200 Feet, which has a proj4 string that looks like this: +proj=lcc +lat_1=34.33333333333334 +lat_2=36.16666666666666 +lat_0=33.75 +...
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### Converting NAD27 Mexico to Lat long [duplicate]

A collaborator has given me coordinates of his sites in NAD27 Mexico. How do I go about converting it to Lat Long? I don't have ArcGIS, but is there a way to do the conversion in that program? Edit: ...
523 views

### Do I need to reproject a NAD83 raster (with no projection) before using it with a shapefile that has a specific NAD83 projection?

I am relatively new to using ArcMap, so I apologize for what I guess is a relatively easy question. I working with a gridded PRISM precipitation raster (www.prism.oregonstate.edu), which has a ...
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I have downloaded parcel files for several counties in Washington State, and am attempting to overlay them on the OpenStreetMap Standard base layer (which is in WGS84 Pseudo Mercator). The majority of ...
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### Unknown SRS in GeoServer for NAD_1983

I am trying to add a GeoTiff to GeoServer but it is appearing as Unknown in Native SRS. Any idea what could be causing this? Details for projection are. PROJCS["...
472 views

### Using lat/long NAD83 in XYtool in Arcgis

I have loaded a raster map that uses WGS 84. I want to locate stations/points on this map by using lat/long coordinated from an online map that uses NAD83. Can I just copy and paste the lat/long ...
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### ArcGIS Desktop:Transformations: Geographic vs Projected?

Arc10. I have two data sets (both CSV files w/ lat and long columns) and I am working on standardizing them to the same projection. File1: NAD27; File2: NAD27, WGS84, and NAD83. I would like all of ...
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I need to measure the distance (with the ruler) of points from two different layers. One layer is NAD83 and the other is NAD27. When importing the NAD27 csv file, I specified it was NAD27. Then I used:...
4k views

### How to Project shapefile from NAD 1983 UTM Zone 12 to WGS 1984 UTM Zone 13N?

I have a question and I have a shapefile that is in NAD UTM Zone 12 and Datum is North American Datum of 1983. What I would liket to reprojection it to NAD 1983 UTM Zone 13N and change the Datum to ...
581 views

### Converting NAD83 (epsg:4269) to WGS84 (epsg:4326) using pyproj

I'm trying to convert US census data (NAD83) to WGS84. I know the difference between the two is quite minor, but trying to apply the transformation using pyproj does not do anything. e.g.: from ...
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I am having trouble changing latitude/longitude data (from spreadsheet dataset) from NAD27 to NAD83. I am using R. The spreadsheet has 2 million coordinates so I can't upload the data for you all to ...
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### Adding UTM grid (NAD83) with 1x1km spacing and label the grid lines?

I'm currently running QGIS 2.18.4 (the latest release). I'm trying to add a UTM grid to my maps, specifically the NAD83 reference system for zone 15N, that hopefully can show UTM coordinates and with ...
70 views

### How to best import a US Map Schematic?

I would like to use the following wiki US Map schematic as a background to my map work. (http://en.wikipedia.org/wiki/File:Blank_US_Map.svg) It is a .svg file, and GeoReferencer is unable to import it....
49 views

### Projecting NAD83 on-the-fly to WGS84 [duplicate]

I have a point feature class in a geodatabase that uses WGS84 as its SRS. A colleage of mine created points in this feature class using an external database containing lat and long values. However, ...
547 views

I have some historic UTM coordinates as NAD27 (556787, 7169250) which I entered into a spreadsheet and have imported into QGIS. I assign them the projection Nad27 / UTM zone 12N (EPSG: 26712) I ...
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This is a related question to this one asked ~3 years ago: Geographic Transformations in Alaska Between NAD83 and WGS84 We are currently on ArcGIS Desktop 10.4.1 What is the best geographic ...
191 views

### XY Coordinates for Points in odd format, not matching any projection

I am trying to match up some data without success. I have a state shapefile from the TIGER/Line and a series of X/Y Coordinates from a St. Louis, Missouri police department (CSV). I am using an ...
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### Proper transformation file to go from NAD83 CSRS UTM 17 to NAD83 UTM 17

Looking to determine which transformation file to select when using the Project tool in ArcMap 10.2.2 to go from NAD83 CSRS UTM 17 and NAD 83 UTM 17. The data I am working with is from Geogratis and ...
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I am attempting to convert a shapefile from NAD83 HARN / egm96 vertical to NAD83 1992 epoch (1991.35) / NAVD 88 vertical. I have attempted to use NADCON to no avail. I know I can use the Define ...
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### Define tool is moving my features

I am using ArcMap 10.4.1 and am having an issue with projections. I am digitizing data off of a basemap which had the projection NAD 1927, accidentally I created the shapefile with NAD 1983. I have ...
211 views

### Project to NAD83 (epsg:26912) with projectRaster - gives epsg:2152

I am working with some Landsat 8 images from the U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center. I am processing the images in R, and after masking the clouds, I ...
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### ArcGIS 10.2.2 Does “Batch Project” work for different input datum?

I have two vector data sets - one is in NAD27 and the other is in WGS84. Normally I reproject one at a time. But can I just use 'batch project' to reproject both of them to NAD83 at once? I was not ...
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### Converting datum?

I need to measure the distance (with the ruler) of points from two different layers. However, one layer is NAD83 and the other is NAD27. I also have a standard ESRI basemap downloaded. The issue I ...
348 views

### Aligning two layers captured in different coordinate systems

I have two layers, one of points (locations of fruit trees) and one of Atlanta zip codes, in an ArcMap, but the layers are not aligning. The zip codes are in the top right and the fruit points are ...