125 reputation
6
bio website ailin.phychembio.com
location Hong Kong
age
visits member for 1 year, 5 months
seen 10 hours ago
stats profile views 6

Feb
28
comment Way to add 1km x 1km UTM grid onto online map service
yes, I will use my own web server. Maybe it is possible to use geospatial database for this purpose.
Feb
27
comment Way to add 1km x 1km UTM grid onto online map service
Thanks for your answer. I have another idea, instead of using QGIS to generate the grid, is to convert UTM grid point into lat/lon. Then we use the points to generate a KML to plot on Google maps. Would it work?
Feb
26
revised Way to add 1km x 1km UTM grid onto online map service
added 10 characters in body; edited title
Feb
26
asked Way to add 1km x 1km UTM grid onto online map service
Feb
24
comment Conversion between WGS84 height and local height datum
@BradHards , you are right!
Feb
23
comment Conversion between WGS84 height and local height datum
Thanks for @DevdattaTengshe providing the link, unfortunately, I can't find HKPD gtx file.
Feb
23
awarded  Commentator
Feb
23
comment Conversion between WGS84 height and local height datum
I don't mean the height above the ellipsoid. It is the local-defined height.
Feb
23
revised Conversion between WGS84 height and local height datum
added 15 characters in body
Feb
23
asked Conversion between WGS84 height and local height datum
Feb
21
revised How can a GPS receiver know the estimated error?
edited body
Feb
21
revised How can a GPS receiver know the estimated error?
added 93 characters in body; edited title
Feb
21
comment How can a GPS receiver know the estimated error?
What I want to know is that, why can a GPS receiver know the estimated error and plot a circle of possible error on the map? From NMEA message, there is no such field, but only DOP. Are they calculating the error from these figures?
Feb
21
asked How can a GPS receiver know the estimated error?
Feb
21
accepted Is there any online tool for converting coordinates between different EPSG?
Feb
21
comment Is there any online tool for converting coordinates between different EPSG?
this tool is really more handy~! How about including Z-axis conversion?
Feb
21
asked Is there any online tool for converting coordinates between different EPSG?
Feb
15
accepted Why are the areas covered by 2 Universal Polar Stereographic (UPS) coordinate different?
Feb
15
asked Why are the areas covered by 2 Universal Polar Stereographic (UPS) coordinate different?
Feb
6
accepted other than GrADS and NCL, any other map/chart scripting and plotting software dedicated for climate and meteorology?