For my current project, almost all data come from the Oregon GIS office
(now called the Geographic Enterprise Office). All the data available for
download (.shp and .e00 primarily) are supposed to be in the state's own
coordinate system, "Oregon Conformal Conic." This is actually Lambert
Conformal Conic with specific bounds, parallels, etc.
Since they're all supposed to have the same bounds and other parameters I
should be able to import them to the same location and map set. But I cannot
do this. If I tell the import wizard to use the existing coordinates it
tells me that they don't match what are in the file. So I have to import
each theme into a different location. My first question is what might be
causing this to happen? I'll reproject them all to a common location/map set
when I get them all in, but wonder why there's an issue.
More importantly, when I look at the location/PERMANENT/DEFAULT_WIND and
WIND files I find the coordinates are far off what they should be, and what
I defined them to be in the GUI. For example, instead of North and South
bounds being 46.2N and 41.9N the files show them as 63N and 39N. Second
question: what might be happening here?
In the meantime, I'll create new locations for all themes then read up on
how to reproject them so they're all recognized as using the same
coordinates and parameters and will overlay properly.
As an aside, I don't see a menu item (under File, I suppose it should be)
to create a new location and map set for a new import. As a result, I exit
grass and restart it. That's too Microsoftish to be correct.
That sounds similar to what I had to do with a custom Albers
projection for Florida. If I recall correctly, I was able to use the
custom parameters from the E$RI definition, and make the same custom
projection in GRASS to work with the data.
Mark
On Sat, Nov 14, 2009 at 6:42 PM, Rich Shepard <rshepard@appl-ecosys.com> wrote:
For my current project, almost all data come from the Oregon GIS office
(now called the Geographic Enterprise Office). All the data available for
download (.shp and .e00 primarily) are supposed to be in the state's own
coordinate system, "Oregon Conformal Conic." This is actually Lambert
Conformal Conic with specific bounds, parallels, etc.
Since they're all supposed to have the same bounds and other parameters I
should be able to import them to the same location and map set. But I cannot
do this. If I tell the import wizard to use the existing coordinates it
tells me that they don't match what are in the file. So I have to import
each theme into a different location. My first question is what might be
causing this to happen? I'll reproject them all to a common location/map set
when I get them all in, but wonder why there's an issue.
More importantly, when I look at the location/PERMANENT/DEFAULT_WIND and
WIND files I find the coordinates are far off what they should be, and what
I defined them to be in the GUI. For example, instead of North and South
bounds being 46.2N and 41.9N the files show them as 63N and 39N. Second
question: what might be happening here?
In the meantime, I'll create new locations for all themes then read up on
how to reproject them so they're all recognized as using the same
coordinates and parameters and will overlay properly.
As an aside, I don't see a menu item (under File, I suppose it should be)
to create a new location and map set for a new import. As a result, I exit
grass and restart it. That's too Microsoftish to be correct.
That sounds similar to what I had to do with a custom Albers projection
for Florida. If I recall correctly, I was able to use the custom
parameters from the E$RI definition, and make the same custom projection
in GRASS to work with the data.
Mark,
So, it may be related to using customized parameters. OK. I can live with
that.
I plan on importing each theme into a different location/map set, then
creating a common one into which I will reproject/move/whatever each
individual theme. Then I should be able to remove all those directories.
Step-by-step I make progress.
BTW, in the late 1980's I was a Technical Program Manager for the St.
Johns River Water Management District. That's where I was first introduced
to GIS (ARC/Info running on the Prime system there).
If I can help, please let me know. But the parameter mapping from
the E$RI to GRASS was fairly straightforward.
For all the themes being imported into a new location, are they all
different projections?
Mark
On Sat, Nov 14, 2009 at 7:25 PM, Rich Shepard <rshepard@appl-ecosys.com> wrote:
On Sat, 14 Nov 2009, M S wrote:
That sounds similar to what I had to do with a custom Albers projection
for Florida. If I recall correctly, I was able to use the custom
parameters from the E$RI definition, and make the same custom projection
in GRASS to work with the data.
Mark,
So, it may be related to using customized parameters. OK. I can live with
that.
I plan on importing each theme into a different location/map set, then
creating a common one into which I will reproject/move/whatever each
individual theme. Then I should be able to remove all those directories.
Step-by-step I make progress.
BTW, in the late 1980's I was a Technical Program Manager for the St.
Johns River Water Management District. That's where I was first introduced
to GIS (ARC/Info running on the Prime system there).
For all the themes being imported into a new location, are they all
different projections?
Mark,
They are all supposed to have the same projection. But, I cannot import
them into an existing location/map set. I'll have each in its own location,
then define a blank location with the same Oregon Conformal Conic
projection, and reproject each separate theme/location into that one. That
will be coverage for the entire state and useful for other projects within
it.
Finally, I'll define another location that encompasses the drainage basin
of interest and sub-sample each statewide layer into that one. Then I can
start looking at how I want to model the hydrology.
For my current project, almost all data come from the Oregon GIS office
(now called the Geographic Enterprise Office). All the data available for
download (.shp and .e00 primarily) are supposed to be in the state’s own
coordinate system, “Oregon Conformal Conic.” This is actually Lambert
Conformal Conic with specific bounds, parallels, etc.
Since they’re all supposed to have the same bounds and other parameters I
should be able to import them to the same location and map set. But I cannot
do this. If I tell the import wizard to use the existing coordinates it
tells me that they don’t match what are in the file. So I have to import
each theme into a different location. My first question is what might be
causing this to happen? I’ll reproject them all to a common location/map set
when I get them all in, but wonder why there’s an issue.
More importantly, when I look at the location/PERMANENT/DEFAULT_WIND and
WIND files I find the coordinates are far off what they should be, and what
I defined them to be in the GUI. For example, instead of North and South
bounds being 46.2N and 41.9N the files show them as 63N and 39N. Second
question: what might be happening here?
In the meantime, I’ll create new locations for all themes then read up on
how to reproject them so they’re all recognized as using the same
coordinates and parameters and will overlay properly.
As an aside, I don’t see a menu item (under File, I suppose it should be)
to create a new location and map set for a new import. As a result, I exit
grass and restart it. That’s too Microsoftish to be correct.
I apparently need to use the override flag. When I try without it the
process halts telling me the projection information in the data does not
match that set in the location.
With the shape file imports I'm now specifying the .prj file for the
projection information. Later today I'll try importing new themes to an
existing location/mapset and see what happens.