316 reputation
19
bio website ailin.phychembio.com
location Hong Kong
age
visits member for 2 years, 4 months
seen 22 hours ago

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?
Dec
22
asked Java Exception when enabling WPS for a GeoServer workspace
Dec
21
comment Why do the components loaded by using WMS and WFS from GeoServer not the same?
Thanks. The file is at drive.google.com/file/d/0B78KovfaygFDOW9Ea016RmFpZjA/…
Dec
19
comment Why do the components loaded by using WMS and WFS from GeoServer not the same?
the shp file: drive.google.com/file/d/0B78KovfaygFDQ0xaZTN4dXk5ZUk/…
Dec
19
comment Why do the components loaded by using WMS and WFS from GeoServer not the same?
For both layer are using WGS84 in QGIS.
Dec
19
revised Why do the components loaded by using WMS and WFS from GeoServer not the same?
edited title
Dec
19
asked Why do the components loaded by using WMS and WFS from GeoServer not the same?
Dec
19
accepted What are the differences between WMS, WFS, WCS, WPS?
Dec
19
comment What are the differences between WMS, WFS, WCS, WPS?
I still cannot understand the difference between WCS and WFS. "Unlike OGC Web Feature Service (WFS), which returns discrete geospatial features, the Web Coverage Service returns coverages representing space/time-varying phenomena that relate a spatio-temporal domain to a (possibly multidimensional) range of properties. As such, WCS focuses on coverages as a specialized class of features and, correspondingly, defines streamlined functionality." Does it mean WFS has more dimensions?