333 reputation
211
bio website ailin.phychembio.com
location Hong Kong
age
visits member for 2 years, 8 months
seen 14 hours ago

Jul
17
awarded  Notable Question
Jul
2
awarded  Curious
May
24
accepted Possible to store 3D features such as dome into geospatial database?
May
23
comment Possible to store 3D features such as dome into geospatial database?
What is the difference of TIN and POLYHEDRALSURFACE in terms of their usage?
May
22
comment Possible to store 3D features such as dome into geospatial database?
I have just had researched on it, how about TIN and POLYHEDRALSURFACE?
May
22
comment Possible to store 3D features such as dome into geospatial database?
It is not necessary be a true curve, but the way of describing such shape.
May
22
asked Possible to store 3D features such as dome into geospatial database?
May
19
awarded  Popular Question
Apr
3
awarded  Popular Question
Jan
27
comment How to determine the Geoid model used by GPS receiver?
In the above NMEA response, there are two heights. One is ellipsoid height, which is the height you mentioned. One is geoid height, which is calculated from a function of coordinates and ellipsoid height. What I mean is the geoid height.
Jan
27
revised How to determine the Geoid model used by GPS receiver?
added 11 characters in body
Jan
27
asked How to determine the Geoid model used by GPS receiver?
Jan
24
comment How can I tell the accuracy of coordinates conversion by cs2cs?
I don't think so. That post is about the accuracy of coordinates. I am talking about the accuracy of conversion.
Jan
24
revised How can I tell the accuracy of coordinates conversion by cs2cs?
edited tags
Jan
24
asked How can I tell the accuracy of coordinates conversion by cs2cs?
Jan
23
accepted Is it due to irregularity of geoid, we cannot convert the height between spherical datum and local datum by cs2cs?
Jan
23
revised Is it due to irregularity of geoid, we cannot convert the height between spherical datum and local datum by cs2cs?
added 211 characters in body
Jan
23
asked Is it due to irregularity of geoid, we cannot convert the height between spherical datum and local datum by cs2cs?
Dec
29
accepted How to fill the area bounded by lines in QGIS?
Dec
29
asked How to fill the area bounded by lines in QGIS?