[Geomoose-users] GM 2.0- tiling performance in county
projections / is it possible to add a custom coordinate to
the status bar while using UTM?
Dan Little
danlittle at yahoo.com
Fri Jun 12 13:47:16 EDT 2009
Yes. I actually wrote an addition to the OL WMS Layer to make that work.
There's still some fine tuning to happen, and, people need to keep in mind that the rectification on the image may not be perfectly aligned with the county coordinates due to some of the shifts that occur when changing projections. That disclaimer in mind, Minnesota County Coordinates seem to line up pretty cleanly with a UTM-15 Aerial photo.
----- Original Message ----
> From: Brent Fraser <bfraser at geoanalytic.com>
> To: Dan Little <danlittle at yahoo.com>
> Cc: GeoMOOSE Users List <geomoose-users at lists.sourceforge.net>
> Sent: Friday, June 12, 2009 9:30:29 AM
> Subject: Re: [Geomoose-users] GM 2.0- tiling performance in county projections / is it possible to add a custom coordinate to the status bar while using UTM?
>
> Dan,
>
> So is OpenLayers doing the re-projection of the WMS image on the client? Wow!
>
> Brent
>
> Dan Little wrote:
> > http://www.geomoose.org/geomoose2/docs/howto/wms_project.html
> >
> > This allows a service to be in a different projection than the Main map with
> no mapserver reprojection. However, it is currently broken with tiles. It's
> something I have to fix. Maybe tonight, maybe this weekend, maybe early next
> week. I'm really ho
> > ping to round out the GM2.0 documentation and make an official release.
> >
> > -Duck
> >
> >
> > ----- Original Message ----
> >> From: Mark Volz
> >> To: Dan Little
> >> Sent: Thursday, June 11, 2009 3:10:22 PM
> >> Subject: RE: [Geomoose-users] GM 2.0- tiling performance in county
> projections / is it possible to add a custom coordinate to the status bar while
> using UTM?
> >>
> >> Dan,
> >>
> >> I noticed your reply. I was able to get the map projection and display
> >> coordinates in Lyon County format. However when I did so what happened was
> >> that the performance of GM slowed way down when I was using tiles in county
> >> coordinates. I do realize that I can turn tiles off, However what I would
> >> really like to do is have the best of both worlds: keep the actual map in
> >> UTM-15 which allows me to use tiling without reprojecting (ie fast) while
> >> having the status bar display XY in county coordinates so that county
> >> coordinate users stay happy.
> >>
> >>
> >> Mark Volz
> >> GIS Specialist
> >> Lyon County, MN
> >> (507) 532-8218
> >>
> >> -----Original Message-----
> >> From: Dan Little [mailto:danlittle at yahoo.com] Sent: Thursday, June 11, 2009
> 2:47 PM
> >> To: Brent Fraser; Mark Volz
> >> Cc: geomoose-users at lists.sourceforge.net
> >> Subject: Re: [Geomoose-users] GM 2.0- tiling performance in county
> >> projections / is it possible to add a custom coordinate to the status bar
> >> while using UTM?
> >>
> >>
> >> HTH,
> >>
> >> http://www.geomoose.org/geomoose2/docs/docs/projections.html
> >>
> >>
> >> ----- Original Message ----
> >>> From: Brent Fraser To: Mark Volz Cc: geomoose-users at lists.sourceforge.net
> >>> Sent: Thursday, June 11, 2009 2:44:15 PM
> >>> Subject: Re: [Geomoose-users] GM 2.0- tiling performance in county
> >> projections / is it possible to add a custom coordinate to the status bar
> >> while using UTM?
> >>> Mark,
> >>>
> >>> I think you're on the right track. I see that the std GeoMoose.html does
> >>>
> >>>
> >>> at line 52. Perhaps the CountyProjection = new
> OpenLayers.Projection('EPSG127083'); does a look-up ?
> >>> Maybe you need to make a proj4js/lib/defs/EPSG127083.js?
> >>>
> >>> Brent
> >>>
> >>>
> >>>
> >>> Mark Volz wrote:
> >>>> Brent,
> >>>>
> >>>>
> >>>> I took a look at trying to get custom coordinates to display on a UTM map
> by modifying the compiled.js file. It appears that openlayers handles work for
> converting the coordinates. I do not know how difficult it would be to add the
> township and range to the status bar.
> >>>>
> >>>>
> >>>> Attached below are the lines that I modified to try to get our coordinates
> to dsiplay. The code returns an error at line 1600 stating: CountyProjection is
> not defined. I am defining the CountyProjection on line 1551 however I wonder
> if OpenLayers is unable to find my custom projection. Any thoughts would be
> helpful.
> >>>>
> >>>> / /
> >>>>
> >>>>
> >>>> Line 43
> >>>>
> >>>> 'coordinate_display' : {
> >>>>
> >>>> xy: true, /* Ground Units */
> >>>>
> >>>> latlon: true, /* Longitude and Latitude */
> >>>>
> >>>> usng: true, /* U.S. National Grid */
> >>>>
> >>>> *county: true /* County Projection */*
> >>>>
> >>>> },
> >>>>
> >>>>
> >>>> Line 738
> >>>>
> >>>> 'coordinate_display' : {
> >>>>
> >>>> xy: true, /* Ground Units */
> >>>>
> >>>> latlon: true, /* Longitude and Latitude */
> >>>>
> >>>> usng: true, /* U.S. National Grid */
> >>>>
> >>>> *county: true /* County Projection test*/*
> >>>>
> >>>> },
> >>>>
> >>>> Line 1550
> >>>>
> >>>> LatLongProjection = new OpenLayers.Projection('WGS84');
> >>>>
> >>>> *CountyProjection = new OpenLayers.Projection('EPSG127083');*
> >>>>
> >>>>
> >>>> Line 1580
> >>>>
> >>>> OpenLayers.Projection.transform(degrees,
> >>>>
> >>>> Map.getProjectionObject(),
> >>>>
> >>>> LatLongProjection);
> >>>>
> >>>>
> >>>> if(CONFIGURATION.coordinate_display.latlon) {
> >>>>
> >>>> html += 'Lat, Lon: ';
> >>>>
> >>>> html += degrees.x.toFixed(3) + ', ' + degrees.y.toFixed(3);
> >>>>
> >>>> }
> >>>>
> >>>> * OpenLayers.Projection.transform(degrees, *
> >>>>
> >>>> * Map.getProjectionObject(),*
> >>>>
> >>>> * CountyProjection);*
> >>>>
> >>>> * *
> >>>>
> >>>> * if(CONFIGURATION.coordinate_display.county) {*
> >>>>
> >>>> * html += 'X, Y: ';*
> >>>>
> >>>> * html += degrees.x.toFixed(3) + ', ' + degrees.y.toFixed(3);*
> >>>>
> >>>> }
> >>>>
> >>>>
> >>>> Line 3560
> >>>>
> >>>>
> >>>> if(this.xml.getAttribute('reproject')) {
> >>>>
> >>>> var new_proj = this.xml.getAttribute('reproject');
> >>>>
> >>>> if(new_proj == 'EPSG:4326' || new_proj == 'WGS84') {
> >>>>
> >>>> dest_proj = LatLongProjection;
> >>>>
> >>>> } *else if(new_proj == 'EPSG127083') {*
> >>>>
> >>>> * dest_proj = CountyProjection; *
> >>>>
> >>>> *}* else {
> >>>>
> >>>> dest_proj = OpenLayers.Projection(new_proj);
> >>>>
> >>>> }
> >>>>
> >>>>
> >>>> OpenLayers.Projection.transform(f.geometry,
> >>>>
> >>>> Map.getProjectionObject(),
> >>>>
> >>>> dest_proj);
> >>>>
> >>>> }
> >>>>
> >>>>
> >>>> var input = Catalog.createElement('input');
> >>>>
> >>>> input.setAttribute('name', stepName);
> >>>>
> >>>>
> >> input.appendChild(Catalog.createCDATASection(output.write(f)));
> >>>> this.xml.appendChild(input);
> >>>>
> >>>>
> >>>> Mark Volz
> >>>>
> >>>> GIS Specialist
> >>>>
> >>>> Lyon County, MN
> >>>>
> >>>> (507) 532-8218
> >>>>
> >>>>
> >>>> -----Original Message-----
> >>>> From: Brent Fraser [mailto:bfraser at geoanalytic.com]
> >>>> Sent: Thursday, June 11, 2009 1:19 PM
> >>>> To: Mark Volz
> >>>> Cc: geomoose-users at lists.sourceforge.net
> >>>> Subject: Re: [Geomoose-users] GM 2.0- tiling performance in county
> projections / is it possible to add a custom coordinate to the status bar while
> using UTM?
> >>>>
> >>>>
> >>>> Mark,
> >>>>
> >>>>
> >>>> I haven't looked at the tiling so I can't comment on the performance
> issue.
> >>>>
> >>>>
> >>>> As for the coordinate display, I see that stock GeoMoose v2.0 now allows
> for three simultaneous coordinate displays:
> >>>>
> >>>> - projected X/Y
> >>>>
> >>>> - geographic Lat/Lon
> >>>>
> >>>> - USNG
> >>>>
> >>>>
> >>>> It would be nice if it was instead a flexible list of any number of
> reference systems that took lat/lon as input and returned a string to be
> displayed.
> >>>>
> >>>> I'm interested in displaying Township/Range values for example, so I'd
> have to write the JavaScript to do the conversion, but it would be nice to be
> able to easily plug it in stock GeoMoose somewhere, similar to the way custom
> projections work in v1.6.1.
> >>>>
> >>>>
> >>>> Brent Fraser
> >>>>
> >>>>
> >>>> Mark Volz wrote:
> >>>>
> >>>>> Hello,
> >>>>> Our users want to use county projections within our mapping
> >>>>> application. In GM 1.6.1 We decided that there was only a minimal
> >>>>> performance hit for the LMIC WMS service(s) to reproject on the fly.
> This is not true in GM 2.0. GM 2.0 allows users the option of using a
> >>>>> tile scheme on the WMS layers. I was impressed with the speed of the
> >>>>> WMS services on the demo. Recently I ported the GM 2.0 demo over into
> >>>>> county projections. I noticed there is a *huge *performance hit if
> >>>>> tiling is turned on.
> >>>>> This left me with a couple options: 1) I can leave the tiling system
> >>>>> off, and the WMS performance would be similar to that of a 1.6 app. 2)
> >>>>> I can abandon the county projection in favor of utm so that I can use
> >>>>> tile cache and hope that no one complains too much that the map is no
> >>>>> longer in county coordinates.
> >>>>> Another thought I had is if I decided to use UTM (to take advantage of
> >>>>> tiling) would it be possible for me to display the XY location in
> >> county
> >>>>> coordinates? If so, does anyone know what file(s) would need to be
> >>>>> modified so that I can display county coordinates in the status bar?
> >>>>> Thanks
> >>>>> Mark Volz
> >>>>> GIS Specialist
> >>>>> Lyon County, MN
> >> ------------------------------------------------------------------------
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> >
> >
> >
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