While the satellite's predecessor Formosat-2 took half a year to create a full topographic map
of Taiwan, Formosat-5 was able to accomplish the same task within three months, from September to December of last year.
These methods have produced good results for some high-quality topographic maps
, but the results are not satisfactory for low-quality maps, mainly due to the following three problems : (1) color aliasing and false colors on scanned maps due to poor paper (such as paper turning yellow over time) or printing quality and the performance of the scanner (on a 96-dot-per-inch (DPI) resolution map, most contour lines are 2 to 4 pixels in width; thus, color deviation occupies a large portion in pixels of lines); (2) conglutination of adjacent lines to form thick lines in some areas of a scanned map where contour lines are densely distributed ; (3) a large number of contour lines gaps caused by intersecting and overlapping information on a topographic map
after color segmentation.
Comparative analysis of elevation data from Shuttle Radar Topography Mission and Topographic map
with GPS: a steep slope test site.
At a later stage, prior to data delivery, Intermap will also provide training to the client on the creation of topographic maps
NASA is working to combine the ASTER data with that of the Shuttle Radar Topography Mission and other sources to produce an even better global topographic map
," he added.
Registration of the Creswell Bay RADARSAT image was performed using a combination of GCPs obtained in the field with a handheld global positioning system (GPS error [less than or equal to] 5 m) and GCPs determined from a topographic map
Once the Xi-100 topographic map
of the sample is obtained, the analysis software is used to isolate, define and characterize the peaks and valleys found on the sample surface.
The maps are based on and aligned to the existing 1:25,000 scale mapsheet grid across the state and have been designed so that four of the 1:30,000 scale maps will fit into a single existing 1:25,000 scale topographic map
If you're comparing GPS coordinates to a topographic map
, you need to set the datum in the GPS unit to match that used for the chart.
Digital Orthophoto Quarterquadrangles (DOQQ) -- a digital aerial photograph that covers one-quarter of the area of a topographic map
With a topographic map
, the reader can determine the elevation of any point on the map, the distance between any two points and the slope between any two points.
of Tuscumbia shows this line and many others which do not appear on the 1971 U.