[ncl-talk] landseamask
Ehsan Taghizadeh
ehsantaghizadeh at yahoo.com
Fri Dec 21 18:38:20 MST 2018
Dear Mary,I really appreciate for your time and very helpful reply and script.You are right whether I want the rain totals over land and water. So your attached figure is what I want. However, the problem is that country boundaries have been covered by rain! I mean (mpGeophysicalLineColor and mpNationalLineColor) which have taken black color, have gone under rain contours.
SincerelyEhsan On Saturday, December 22, 2018, 3:42:12 AM GMT+3:30, Mary Haley <haley at ucar.edu> wrote:
Ehsan,
I was concerned that the last script might have slowed down the plotting too much, so I created a second version that is faster. It goes back to setting tfDoNDCOverlay=True, which makes the plotting faster.
This time, however, instead of using "overlay" to overlay the plots, the script simply creates three plots:
1. Filled terrain plot over a map2. Filled rain total plot 3. WRF map with city markers, text, and shapefile outlines added
and then it makes sure these three plots have the same vpXF / vpYF / vpWidthF / vpHeightF values and draws them one after. This script takes about 4 seconds on my Mac compared to 11 seconds for the other one. The advantage of this script is that you don't have to deal with as many "DrawOrder" resources, as the draw order is controlled by creating individual plots and drawing them in the order you want them to appear.
--Mary
On Fri, Dec 21, 2018 at 8:34 AM Mary Haley <haley at ucar.edu> wrote:
Ehsan,
That's what I wasn't sure of, whether you wanted the rain totals over land and water.
This involved a minor tweak to a draw order resource. Is the attached what you want?
Here are some of the changes I had to make to get this script to work:
- In order to get the markers and shapefile polylines to not be covered up, I had to add them to the rain total plot, since this plot is the one that gets drawn last.
- Since the rain total plot was a simple contour plot with no concept of X and Y coordinate values, you can't add lat/lon markers and shapefile polylines to it because it needs lat/lon information to do this. So, I had to add sfXArray and sfYArray resources for this plot, and that makes it possible to attach lat/lon stuff to it.
- To stay consistent, I also set sfXArray and sfYArray to the terrain plot.
- Now that sfX/YArray are being set, you do NOT want to set tfDoNDCOverlay for either plot. Also, you must set gsnAddCyclic to False for both plots so it doesn't try to add a longitude cyclic point.
Unfortunately, when you set sfX/YArray, this means your plot takes a longer to draw, because now it is doing a transformation calculation.
See attached.
--Mary
On Fri, Dec 21, 2018 at 12:39 AM Ehsan Taghizadeh <ehsantaghizadeh at yahoo.com> wrote:
Dear Mary,In your attached figure, water in lake cover total rain and this is wrong! But poly line of shapefile are seen under rain total and this is OK.
SincerelyEhsan On Friday, December 21, 2018, 4:30:42 AM GMT+3:30, Mary Haley <haley at ucar.edu> wrote:
Thanks for providing the files.
I think I understand the ordering of everything that you want, and it can be really frustrating trying to do this with NCL.
The issue is simply that since the lines and markers are being added to the terrain map, and then the rain total contours are being drawn on top of that, they are going to cover up the lines and markers.
The solution seem to be to add the lines and markers to the rain total plot instead, but in order to do this, you have to provide lat/lon coordinate information to the rain total map, so that the lines and markers are added in the correct locations.
Before I go any further with this, can you tell me if the attached image is what you are looking for?
thanks,
--Mary
On Thu, Dec 20, 2018 at 4:43 PM Ehsan Taghizadeh <ehsantaghizadeh at yahoo.com> wrote:
Dear Mary,I'm so sorry that this debugging has been prolonged. I've tried to fix the problems by myself, however unfortunately I failed.I've put input data files in ftp: (wrfout_d01_2018-12-19.tar.gz, shp_stations.tar.gz, shp_ostan.tar.gz), also my color table (tvprecp.rgb).I've also attached my script, and two figures which reflect my problem. As you can see, national boundaries (black poly lines) and province boundaries (red poly lines) are masked in WRF5.png by precipitation contours.
I hope you have time to consider my problem again.SincerelyEhsan On Friday, December 21, 2018, 2:01:08 AM GMT+3:30, Mary Haley <haley at ucar.edu> wrote:
I'm not sure I follow all that logic, because I'm losing track of what's being drawn when. :-)
But, this might work:
lnres at gsPolyDrawOrder = "PostDraw"
If that doesn't work, then I'll need more clarification on what you mean by things being masked or not masked. For example, in the image you provided, I can see the red province lines, but I'm not sure where you were expecting the markers to show up.
At some point I may need to have your script and data if I'm going to continue debugging this.
--Mary
On Thu, Dec 20, 2018 at 12:36 PM Ehsan Taghizadeh <ehsantaghizadeh at yahoo.com> wrote:
Dear MaryAs you suggested I add following line: res_tot at cnLineDrawOrder = "PostDraw"
and it works well. Now I have contour lines and also raster contours become smooth. However I still have problem with outlineboundaries and also province shapefiles. I've used below line: res_ter at mpOutlineDrawOrder = "PostDraw"
However as you may guess it doesn't work, because after that I have:
res_tot at cnFillDrawOrder = "PostDraw"Same problem is for province shapefile, as province boundaries are masked (red lines). But interesting (may be just for me) markers in other shapefile (MASA, OIGG, ...) are not masked!So the remained problem is masking of outlineboundaries and province boundaries in shapefile (WRF4.png is attached).
I'll be thankful if I could have your help about it.
SincerelyEhsan On Thursday, December 20, 2018, 8:29:02 PM GMT+3:30, Mary Haley <haley at ucar.edu> wrote:
Hi Ehsan,
Good catch on the inland water resource addition!
When you set cnFillDrawOrder to PostDraw, this causes the filled contours to be drawn last, and since these are raster contours and hence blocky looking, you are seeing the artefacts of the blocks bleeding into the contour lines
There is a cnLineDrawOrder resource, so perhaps try setting to to "PostDraw" and see if it gets drawn on top of the filled contours. You might have to play around with the cnFillDrawOrder too, maybe setting it to "Draw" instead of "PostDraw".
If you continue to have problems, let us know. There are other ways to do this kind of ordering, but it can get a little more involved.
Good luck,
--Mary
On Thu, Dec 20, 2018 at 6:41 AM Ehsan Taghizadeh <ehsantaghizadeh at yahoo.com> wrote:
Dear MaryYour answer is exactly what I want. However I still have 2 problems and I'll be thankful for any help about them.1. Caspian sea and Black sea didn't fill (WRF1.png in attached)! So I added following line: res_ter at mpInlandWaterFillColor = "SkyBlue"
and it seems works (WRF2.png in attached).2. However in both figures I missed last shaded contours (here precipitation) on water lands! So I added following line too: res_tot at cnFillDrawOrder = "PostDraw" ; Also can try "Predraw"Now I missed contour lines for both precipitation and boundaries (WRF3.png in attached)! Beside that I've got RasterFill for precipitation. I've used res_tot at cnFillMode = "RasterFill"however it didn't affect for figures (WRF1.png and WRF2.png), but it affected WRF3.png!
My plot lines are as below: plot_terrain = gsn_csm_contour_map(wks,HGT,res_ter) add_outlines_to_map(wks,plot_terrain) ; OK add_places_to_map(wks,plot_terrain) ; OK plot_raintot = gsn_csm_contour(wks,RainTotal,res_tot)
overlay(plot_terrain, plot_raintot) draw(plot_terrain) frame(wks)
I hope my email is clear and I ask my problem correctly. Also I attached my script, even though it seems sloppy and doesn't have input data!Any help will be appreciated.
SincerelyEhsan On Wednesday, December 19, 2018, 7:55:28 PM GMT+3:30, Mary Haley <haley at ucar.edu> wrote:
Ehsan,
Do you mean that you want to fill the ocean in some solid color and hence mask any data in that area? If so, you can try:
res at mpFillOn = True res at mpOceanFillColor = "SkyBlue" ; use whatever color you want res at mpLandFillColor = "Transparent" ; to make sure land doesn't get filled
You might also need to set some draw order resources, to make sure the filled contours and filled map areas get drawn in the right order:
res at cnFillDrawOrder = "Draw" ; Also can try "predraw" res at mpFillDrawOrder = "PostDraw"
You can see some masking examples at:
http://www.ncl.ucar.edu/Applications/mask.shtml
Use your browser search to look for "draworder".
--Mary
On Wed, Dec 19, 2018 at 8:13 AM Ehsan Taghizadeh <ehsantaghizadeh at yahoo.com> wrote:
Hi,May I ask how to fill sea (lake, ...) areas differently from land. I've tried using "https://www.ncl.ucar.edu/Applications/grid_fill.shtml" (grid_fill_5.ncl) and I've got attached map.That part which I used from grid_fill_5.ncl are:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; Read/open NCL'ls crude (1x1) land-sea mask;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
a2 = addfile("$NCARG_ROOT/lib/ncarg/data/cdf/landsea.nc","r") lsdata = a2->LSMASK lsm = landsea_mask(lsdata, xlat, xlong)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
HGT2 := HGT ; replicate for plot HGT2 = where(lsm.eq.0 , HGT2 at _FillValue , HGT2) HGT2 = where(lsm.eq.2 , HGT2 at _FillValue , HGT2) HGT2 = where(lsm.eq.4 , HGT2 at _FillValue , HGT2);;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
where "HGT" is "Terrain Height" of WRF. The issue of the attached file is raster filled of sea areas. However is there a better way to fill sea areas?
SincerelyEhsan_______________________________________________
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