I am using FME's Tester to select objects that are bigger than 1 meter.
My data are in EPSG:4326.
How much is 1 meter in decimal degrees?
Convert 1 Meter to Decimal Degrees – Using FME for Coordinate Conversion
coordinate systemfme
Related Solutions
The easiest way is to go to the TOC table of contents...
right click the data frame (usually named layers).
Select properties. and the coordinate system tab.
then find the gcs system you would like to have as the final output
set the "document " to that by OK'ing out of the dialogs.
Then when you right click on the layer you want re-projected and select >Data
export data.
You get the export dialog.
Select the "same as data frame" option..
Give it a location and you are done.
In QGIS, it's very straightforward. First, ensure that you have the correct coordinate system for your original shapefile:
- Add the layer to the map canvas;
- Right-click on the layer and select "Set layer CRS";
- Choose the correct coordinate reference system (CRS) from the list - it is probably in UTM (a metric grid) and you will have to know the zone and datum for the data; it may be already automatically selected!
After this:
- You right-click on the layer and select "Save as ...":
- Click 'Browse' near CRS in the resulting dialog and select WGS84 EPSG:4326 as the CRS for the new file - this will save it with decimal degrees as the coordinate system.
It's a very good idea to make sure you select a good name in the "Save as" dialog - appending the coordinate system to the name can be very helpful, e.g. my_shape_file_DD_WGS84 to remember that it's in degrees, WGS84.
Best Answer
Although I like Alex's answer - it's better to reproject than to simply convert decimal degrees to metres with a fixed multiplier - I never really like having to reproject data back and forth if not necessary. I figure you're bound to lose some degree of accuracy/precision.
What I would try is the ReprojectLengthCalculator transformer. With that you could measure the length in decimal degrees and reproject that attribute value. You wouldn't need to reproject the feature to metres and back again.
The drawback here is that I think it will only really work with 2-point lines and - for some reason - you'll have to calculate the angle of that line as part of the input.
If you do reproject as Alex suggests, then I would encourage you to do that as a separate stream, and merge the resulting distance back onto the original data. That way you retain a good (un-reprojected) copy of the geometry.
I also suggest reprojecting to a dynamic coordinate system;
_AZMED_for measuring distances, and_AZMEA_for measuring areas. Each feature effectively gets converted to its own equal-distance (equal-area) coordinate system, giving the best results.I think it would look something like this:
You could put the Tester after the FeatureMerger, but I think this configuration is more efficient. The FeatureMerger will need a unique ID on the features to work.