Map Rectifier

 — "From MetaCarta Labs"

Hey wait! Didn't there used to be a bunch of maps here?
The rectifier database was corrupted by some unknown process. While we work on getting the old database back to the way it was, we've created a copy so that users can continue to use the rectifier. Sorry about that.

File to upload:
Title of Map:
Description:

Access:

By uploading images, you are agreeing to allow anyone to view or use these maps, add GCPs, remove GCPs, and so on. Although you do not grant a copyright license to other users, images are currently all public, so any image you upload will be made available and usable to other users. There is no expectation of privacy or protection of data.

If you are interested in seeing more development on this service, or if you have a use for this service that you'd like to share with us, head over to the MetaCarta Labs weblog, or email us: labs at metacarta dot com.

Commonly Asked Questions

Is this open source?
We're currently still working on the code behind this service. We're interested in hearing what needs you have for the service, and any possible needs you have for an open source package. If you want to use this code in any application, send us email at labs at metacarta dot com so we can find out what people need from an Open Source web-based rectifier.
Where can I find maps to try out?
The University of Texas Map Library has a great collection of maps that you can try out. Or just use one of the existing maps in the service: It's all open!
How can I use these maps in my own applications?
Each map page has a link to a URL which can be used as a WMS OnlineResource. If you have a WMS client, you can use this URL in your WMS application.
Alternatively, you can download the warped source data from your image. This data is made available as a GeoTIFF, usable in many applications. Note that these files are very large -- in some cases 20-30 times the size of the original images -- because TIFF is not a lossy format like jpeg, the original format of many of these images.
If you would like us to add support for downloading the images in a different format, please email us at labs at metacarta dot com.
What is RMS Error? What is mean RMS Error?
RMS error is an estimate of how far off a given point is from the resulting warped image. This RMS error is currently calculated based on a linear warp. Higher RMS error estimates are worse: you should aim to keep these error numbers as small as possible. Usually a high error value indicates that a single ground control point is incorrectly positioned: deleting the highest error document will often help the entire map warp better. The mean RMS error is a single value which represents the current level of error on the map: if this value goes down, your map will probably warp more cleanly.
© 2006 MetaCarta, Inc., released by MetaCarta Labs