You can upload images of any dimensions, portrait or landscape, but the file size needs to be under 8 megabytes. We do resize them so their longest dimension is 640 pixels on the main photo page. Optionally, you can also release larger versions of various sizes for downloading and re-use. http://www.geograph.org.uk/article/Larger-Uploads-Information
Ideally images shouldn't have a longest dimension of fewer than 480 pixels. While we might accept such images if they hold particular interest, we would really prefer a larger image.
We do record the EXIF headers from your original image, so it is advantageous to upload your original camera image or use image editing software that maintains the EXIF data if you want this information to be kept (but we don't currently make use of the data).
Some cameras record the orientation of the camera into the exif data, and some software evaluates that exif field if present. Geograph just takes the picture as stored, without bothering with the orientation. That means users whose software auto-rotates will need to rotate their image before uploading. If that is the case, it should be obvious from step 3 of the submission process as that shows the picture as it will show on Geograph.
If Geograph supported auto-rotation, it would lead to unexpected results for people whose software doesn't auto-rotate, so we can't win.
Most GPS receivers allow you to change the datum and display format to OSGB36 and British National Grid, the convention used by the Ordnance Survey of Great Britain. If you're using a GPS built into a mobile phone, this may not be possible, and your coordinates will always be in WGS84 lat/lon format. If you also use your GPS phone to take your geographs, it should store the positions in the GeoExif header, which Geograph should interpret correctly as camera position.
Otherwise, you can use the Google map part of the submission routine ('locate/find on map') and enter your lat/lon coordinates in the format 'loc:N51.7252,E0.5905' in the box below the Google map. This will look up the grid reference for the location and insert it as _subject_ position into the submission dialogue. You may have to adjust this unless the subject was right in front of you.
Alternatively, there is a conversion tool here on Geograph Tools http://www.nearby.org.uk/coord.cgi?f=conv from which you can copy and paste. There's also a bulk conversion tool on the Ordnance Survey website http://gps.ordnancesurvey.co.uk/convertbatch.asp?location=0 which will convert lat/lon co-ordinates into grid references, although this uses a slightly different datum for the lat/lon base and will produce a small error (insignificant for Geograph purposes).
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