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...Topographic mapping rtk gps standard operating procedures suggested citation us geological survey unpublished protocols usgs western ecological research center san francisco bay estuary field station vallejo ca disclaimer any use of trade product or firm names in this publication is for descriptive purposes only and does not imply endorsement by the u s government purpose objective ground based using real time kinematic global positioning system a useful tool collecting high resolution elevation data at landscape level mobile collects quickly measures within an accuracy cm to tie vegetation community structure throughout study site surveys can be completed conjunction with see section methods figure points bottom interpolated digital model dem top map preparation prepare gridlines desired example we typically record every meters along transects spaced apart x m grid are stratified from low elevations transect on individual marsh characteristics i e accessibility channel location etc ma...