792 reputation
1922
bio website plaza.ufl.edu/seenhzj
location
age
visits member for 3 years, 6 months
seen Oct 21 at 19:42

Phd Candidate in Department of Geography, University of Florida


May
15
comment Validate a gml file
I think this is generated by sql server. But I really have difficulties to use this.
Mar
20
comment ModelBuilder: How2 pipe output of Iterate Raster tool into Raster Calculator tool?
Why not use arcpy? It would be easier to iterate all the raster by the command ListRasters and do your calculations by the command RasterCalculator.
Mar
19
comment Heatmap.js is not displaying on OpenLayers
Yes, but it doesn't return any bugs.
Mar
1
comment Performing Raster Noise Reduction and Edge Smoothing?
Hello! If you don't mind, could you send me your contact information? I would like to acknowledge you in my research. Thank! @whuber
Feb
20
comment Draw two separate lines from A to B and B to A
@Andy R should be fine for me.
Feb
20
comment Draw two separate lines from A to B and B to A
@whuber Thanks for your suggestions. I was thinking a way to solve this: 1) Define a function DrawArcBetween(Origin, Destination, arc) 2) Define a Hashset<Destination,Origin> 3) If the destination, origin pair can be found in the Hashset, take the negative of the arc. Don't know if there would be simpler way to solve this...
Jan
4
comment Finding minimum bounding extent of given pixel value within raster?
I did this exactly. Is there any automatic way? I think the raster to polygon algorithm has a step to extract the minimum bounding box of the raster.
Jan
4
comment Finding minimum bounding extent of given pixel value within raster?
@whuber I saw your solution somewhere else, but still not sure how I can implement your method. Could you show me some more detail of this?
Nov
15
comment Performing Raster Noise Reduction and Edge Smoothing?
Thank you @whuber you always give me great answers!
Nov
14
comment Performing Raster Noise Reduction and Edge Smoothing?
Thanks for pointing me to the right direction´╝ü
Oct
8
comment Iterate features on SpatialPolygonsDataFrame in R
Thank you very much! I think this method will greatly accelerate my codes!
Oct
5
comment Create Zonal Grid in R
I think your approach is very nice. The only concern for me is the smaller rectangles around the edge area. I think for ecological study, it requires almost all the grids to have similar area.
Oct
5
comment Create Zonal Grid in R
Thanks @whuber, I think my function just works for square grids which I need. Also, what do you man by "padding out the array" for this method?
Oct
4
comment Create Zonal Grid in R
I think the kronecker product will work and I uploaded my answer. Thank you very much though!
Oct
4
comment Create Zonal Grid in R
Thanks for your answer @yellowcap. I am wondering if there is anyway to get rid of the double for loop. It could be very slow for a large matrix.
Oct
4
comment Raster grid for zonal statistics in R
@JeffreyEvans Thank you. I have added another question on how to create zonal grid here gis.stackexchange.com/questions/34895/create-zonal-grid-in-r
Oct
4
comment Detect whether there is a spatial polygon in a spatial extent
I think it makes sense, my concern is how to perform spatial query in R.
Sep
29
comment Detect whether there is a spatial polygon in a spatial extent
I will consider it as an extent. So do you have some suggestions on methods?
Sep
28
comment Detect whether there is a spatial polygon in a spatial extent
I think clipping can do this, but if I have a lot of zones to process?
Sep
23
comment Count raster value in a bounding box (spatial extent)
is there anyway just perform spatial query rather than cropping the image? Cropping might be very slow for processing.