>From: "Paul L. Sirvatka" <address@hidden> >Organization: College of DuPage >Keywords: 200210041733.g94HXZ106826 McIDAS NEXRCOMP BAR IMGREMAP IMGCHA Paul, >The Bar command should have a range? What does that mean? RAN= should specify the range of display values represented in the data bar. I see by your comment below that it doesn't. This looks like a bug. >I took the nexrad composite and SU'd everything out of it so it just shows >5 to 75dbZ's. I created a nice looking color table (EU) to go with it. I >wanted the Bar to show correctly but it still outlines 0 to 80 dbZ. Even >when I plotted 55 to 75 range, it still showed eveything. In other words >the keywords RAN did nothing I could see. >Also...shouldn't the bar plot *over* the maps? The color portion of the BAR is drawn in the image plane; the annotation portion of the BAR is drawn in the graphics plane. Since all graphics will be on top of displayed image values, the map lines can/will go through the data bar. You can control this by blanking out the rectangle in which the data bar will be drawn before running BAR. Check out the CW command. You will need to play with it to get the blanking box sized the way you want it (use the PC command to position the cursor and then run the CW command). >The maps plot through the bar which makes things look a bit weird! I guess that this never bothered me. Different eyes, different perspective :-) >Thanks for the help. No worries. >From address@hidden Fri Oct 4 13:05:04 2002 >As long as I am asking questions: >I am trying to display these NEXRAD composites in the smae projection as >my satellite images. I have used imgremap to accomplish this. BUT... OK. Another cute thing you can do is "overlay" the radar echos from the NEXRAD image on top of a satellite image. You do this using the new, experimental FRMOLAY command. Here is one example: IMGDISP RTIMAGES/GE-IR LATLON=39 83 PLACE=C MAG=2 2 EU=IMAGE SU=X ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLUSAM MCOL=1 WID=1 GRA=(GRA);BAR (GRA) SU=IRTEMP X COL=7 ORIENT=VER' FRMOLAY NEXRCOMP/1KN0R-NAT UNIT=BRIT RAN='3:85,86:96,97:107,108:119,120:130,131:141,142:153,154:164,165:175,176:187,188:198,199:209,210:221,222:232,233:243,244:255' INT=0 GU=RADAR16_32 An example of this can be seen at: http://www.unidata.ucar.edu/staff/tom/gifs/nexrolay.gif The nice thing about displaying the radar echos in the graphics plane is that they can be toggled off and on (using the ALT-W toggle) or any display level used in the radar overlay can be turned off and on individually (using the 'GU OFF level bframe eframe' and 'GU ON level bframe eframe' command sequences). To get a feeling for this, do the load as I indicated above (you have to be running McIDAS-X v2002 to get the FRMOLAY command and the RADAR16_32 graphics palette AND you have to be running a session that supports 32 graphics levels). After getting the image loaded and radar echos displayed on top of the image, then use the ALT-W toggle to turn all graphics off and on (hold down the ALT key while pressing the W key). With all graphics display levels on, try turning off selected levels: GU OFF 32 GU OFF 31 GU OFF 30 GU OFF 29 GU OFF 28 GU OFF 27 ... Then turn them back on: GU ON 32 GU ON 31 GU ON 30 GU ON 29 GU ON 28 GU ON 27 ... By putting the GU OFFs and GU ONs into a script, you could have various levels flash off and on. >I have used the stretch utility to get just the 5-75 dbZ levels (as >stated in a previous question.) But if I copy this image to a satellite >darea to get the same projection, i lose the ability to use the SU since >it is now the wrong type. I hope this is clear. I do not know my way >around this problem. At this point, you can either create a stretch table for the remapped image (using the type that it is in), or you can use the IMGCHA command to change the SS (Sensor Source) of the destination to make it what it was originally. Here is an example: IMGCOPY RTIMAGES/GE-IR MYDATA/IMAGES.1234 SIZE=ALL IMGLIST MYDATA/IMAGES.1234 FORM=EXP Image file directory listing for:MYDATA/IMAGES Pos Satellite/ Date Time Center Res (km) Image_Size sensor Lat Lon Lat Lon --- ------------- ------------ -------- ---- ---- ----- ----- ------------ 1234 G-8 IMG 4 OCT 02277 19:15:00 23 71 Band: 4 10.7 um Surface temp; longwave window 4.59 4.67 1400 x 1728 proj: 0 created: 2002277 195210 memo: RT GVAR type:VISR cal type:BRIT offsets: data= 2816 navigation= 256 calibration= 0 auxillary= 0 doc length: 0 cal length: 0 lev length: 0 PREFIX= 0 valcod: 0 zcor: 0 avg-smp: N start yyddd: 2002277 start time:191515 start scan: 401 lcor: 2785 ecor: 9141 bytes per pixel: 1 ss: 70 Resolution Factors (base=1): Line= 4.0 Element= 8.0 IMGLIST: done IMGREMAP NEXRCOMP/1KN0R-NAT MYDATA/IMAGES.1234 SSIZE=ALL IMGLIST NEXRCOMP/1KN0R-NAT FORM=EXP Image file directory listing for:NEXRCOMP/1KN0R-NAT Pos Satellite/ Date Time Center Res (km) Image_Size sensor Lat Lon Lat Lon --- ------------- ------------ -------- ---- ---- ----- ----- ------------ 362 RADAR 4 OCT 02277 19:42:00 TWX Band: 27 No Information Available 1.02 1.02 3000 x 4736 proj: 0 created: 2002277 195326 memo: 1 km CONUS N0R Composite [dBZ] type:NEXR cal type:RAW offsets: data= 1024 navigation= 256 calibration= 0 auxillary= 768 doc length: 0 cal length: 0 lev length: 0 PREFIX= 0 valcod: 0 zcor: 0 avg-smp: N start yyddd: 2002277 start time:194200 start scan: 0 lcor: 1 ecor: 1 bytes per pixel: 1 ss: 7 Resolution Factors (base=1): Line= 1.0 Element= 1.0 IMGLIST: done IMGCHA MYDATA/IMAGES.1234 BAND=27 SS=7 Directory Block Changes Changed Band Sequence from: 4 to: 27 Changed Sensor Source from: 70 to: 7 Transferring AREA data outbound, bytes= 736 Image file directory listing for:MYDATA/IMAGES Pos Satellite/ Date Time Center Res (km) Image_Size sensor Lat Lon Lat Lon --- ------------- ------------ -------- ---- ---- ----- ----- ------------ 1234 RADAR 4 OCT 02277 19:15:00 Band: 27 No Information Available 4.59 4.67 1400 x 1728 proj: 0 created: 2002277 195314 memo: RT GVAR type:VISR cal type:BRIT offsets: data= 2816 navigation= 256 calibration= 0 auxillary= 0 doc length: 0 cal length: 0 lev length: 0 PREFIX= 0 valcod: 0 zcor: 0 avg-smp: N start yyddd: 2002277 start time:191515 start scan: 401 lcor: 2785 ecor: 9141 bytes per pixel: 1 ss: 7 Resolution Factors (base=1): Line= 5.0 Element= 5.0 IMGLIST: done IMGCHA: Done ... I hope that this helps... Tom
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