[Geomoose-users] map-source; only 2 valid types?
Dan Little
danlittle at yahoo.com
Tue Sep 29 14:46:04 EDT 2009
OpenLayers proj4js to do measurement when setup correctly.
----- Original Message ----
> From: Brent Fraser <bfraser at geoanalytic.com>
> To: Brian Fischer <bfischer at houstoneng.com>
> Cc: Dan Little <danlittle at yahoo.com>; "geomoose-users at lists.sourceforge.net" <geomoose-users at lists.sourceforge.net>
> Sent: Tuesday, September 29, 2009 12:21:04 PM
> Subject: Re: [Geomoose-users] map-source; only 2 valid types?
>
> Brian,
>
> That would be great!
>
> One thing I noticed with my scale experiments is a potential problem with the
> measure tool with projections (like Mercator) that have a wide varying scale
> factor. A standard Mercator (with latitude of true scale of 0, the equator)
> has a scale factor of about 0.6 at 54 degrees of Latitude (e.g. Edmonton Alberta
> Canada). That means that an object with a length of mile (e.g. a Section line)
> will measure 0.6 miles with the measure tool. While changing the Latitude of
> True Scale (or the scale factor k0) will minimize the problem if you can limit
> your mapping to about 10 degrees of Lat, it's not a solution to mapping the
> world and wanting to measure small distances.
>
> The solution would be to have a function that would return the scale factor at
> a given Latitude (or given lat and lon to make applicable to all projections)
> and apply that to the distance displayed.
>
> I don't know if/how OpenLayers handles the issue...
>
> Brent Fraser
>
>
> Brian Fischer wrote:
> > Brent,
> > I'm going to see if I can get funding to make it happen.
> >
> > The limitations are:
> > - your application would have to be in the Google web Mercator projection
> > - no printing
> >
> > The raster reprojection would not be possible. That only works for a WMS
> service and I have found it is not that accurate when zoomed to small scales.
> This also has a little hit on performance but not bad.
> >
> > Brian Fischer, CFM GIS Project Manager
> > Houston Engineering, Inc.
> > Phone: W: 763.493.4522 / M: 763.229.2734
> >
> >
> > -----Original Message-----
> > From: Brent Fraser [mailto:bfraser at geoanalytic.com] Sent: Monday, September
> 28, 2009 11:26 AM
> > To: Brian Fischer
> > Cc: 'Dan Little'; geomoose-users at lists.sourceforge.net
> > Subject: Re: [Geomoose-users] map-source; only 2 valid types?
> >
> > Brian,
> >
> > I'd be interested in seeing Google Maps access implemented, and I'd be
> willing to give up printing the Google Maps layer if it meant I could view it on
> the screen.
> >
> > Looking through GM v2's main.js and OpenLayer's google.html example, it
> appears that adding a layer type of "Google" looks simple. But I'm concerned
> about the projection. Would it mean that my site would have to use Spherical
> Mercator as the view projection? Would Dan's recent enhancement of raster
> projection in OpenLayers be useful so I could set a view projection of UTM? Or
> would performance be a problem?
> >
> > Best Regards,
> > Brent (the other Brent) Fraser
> >
> >
> > Brian Fischer wrote:
> >> Brent,
> >>
> >> These two layer types that are on my wish list to integrate into GeoMOOSE,
> as well as Tilecache layer types. Maybe we could pool some money together to
> have Dan implement them?? As Dan and I have talked about this in the past the
> tricky part is whether you need to be able to print these layer types to .pdf.
> That requirement would be a much larger effort than just making them viewable.
> >>
> >>
> >> Dan,
> >>
> >> Met Council just released a new basemap AGS Rest API service for the twin
> cities. See snippet from email below. Jessica did mention she tested this and
> got it to work with OpenLayers. It's pretty nice and sure would be cool to show
> it can be used in GeoMOOSE!
> >>
> >>
> >> *Metropolitan Council ArcGIS Base Map Services*
> >>
> >>
> >> The Metropolitan Council is making available two cached base map services
> through ArcGIS Server./ /The Metropolitan Council base map contains common data
> layers symbolized and shown appropriately for 10 scale levels; including
> roadways, water features, political boundaries, Parks, trails, and land marks.
> The base map will be updated as necessary to maintain current data - at least
> quarterly to allow for MetroGIS municipality and road updates.
> >>
> >> These services are available for use in within ArcMap, in web applications
> through use of Rest Services, and as a layer in Google Earth.
> >>
> >> * *BaseMap*: In Web Mercator Projection suitable for use in mashups
> >> with Google Maps.
> >>
> http://gis.metc.state.mn.us/ArcGIS/rest/services/BaseLayer/BaseMap/MapServer
> >>
> >>
> >>
> >> * *UTMBaseMap*: Same Features and Symbology as BaseMap above, but
> >> projected for UTM, better for use with other MetroGIS data.
> >>
> http://gis.metc.state.mn.us/ArcGIS/rest/services/BaseLayer/UTMBaseMap/MapServer
> >>
> >>
> >>
> >>
> >> *Brian Fischer,* CFM GIS Project Manager
> >> *Houston Engineering, Inc.*
> >> Phone: W: 763.493.4522 / M: 763.229.2734
> >>
> >>
> >> *From:* Dan Little [mailto:danlittle at yahoo.com]
> >> *Sent:* Wednesday, September 23, 2009 9:56 AM
> >> *To:* Brent Lund (ADM); geomoose-users at lists.sourceforge.net
> >> *Subject:* Re: [Geomoose-users] map-source; only 2 valid types?
> >>
> >>
> >> Currently unimplemented. The reason is that the actual requests are managed
> by GeoMOOSE and require full integration in with the catalog to work correctly.
> This simply hasn't happened with those two types yet. ArcGIS93Rest may take a
> while because I'm not sure anyone has a test server for me to utilize.
> >>
> >>
> >> *From:* Brent Lund (ADM)
> >> *To:* "geomoose-users at lists.sourceforge.net"
> >>
> >> *Sent:* Wednesday, September 23, 2009 9:51:56 AM
> >> *Subject:* [Geomoose-users] map-source; only 2 valid types?
> >>
> >> Is the documentation http://www.geomoose.org/moose/docs/mapbook.html
> >> correct in referring to only 2 valid types (mapserver, wms). Are
> >> other OpenLayers types valid (but undocumented)? In particular I
> >> am interested in utilizing OpenLayers types Google and ArcGIS93Rest.
> >>
> >>
> >> Thanks,
> >>
> >> Brent
> >>
> >>
> >>
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> >>
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