If you change the map projection to be a local coordinate system:
Click Edit-Properties on the map window.
Uncheck Auto-Projections.
Click Change Projection.
Click the Coordinate System Tab and choose a system that is appropriate for your region.
Click OK. Click OK.
You can then specify a grid in "distance" units rather than degrees:
Choose Tools-Geographic Utilities-Create Vector Grid.
Choose Cover the map window with a fixed grid spacing
You can now define the grid cells using the units for your coordinate system.
Stewart
At 04:19 PM 5/26/2005 -0700, you wrote:
Hi Chris,
Your creatrive solution is fastastic to say the least but what I
don't understand is why Caliper would want us to measure
(physically!!!) our computer screens to come up with such a seemingly
easy task? In fact, Caliper can have a variable named grid size (in
square units) and do the calculations automatically. I know that it is
quite a difficult task to have equal area squares when the map is
essentially a spherical projection but there are easy transformations
that should do the job. This is a suggestion that Maptitude may wish
to pursue for its next update. Regards, Rudy B.
On 5/26/05, Chris Wagner <[EMAIL PROTECTED]> wrote:
> A bit of confusion here. you say a grid of 10 sq miles but you mention
> spacing of 5 miles????
>
> What I was able to do is open a map of WI select the state and scale it to
> selection
> Map> Scale
> show entire layer State
> selection set Selection
>
> say OK
> Measure with the ruler icon the size of the window I came up with 338 by
> 331 miles
>
> the square root of 10 is 3.1654205
> take 338 * 3.1654205 = 106.7
> take 331 * 3.1654205 = 104.5
>
> No go to the tools > geographic utilities> create vector grid
> select cover map window with a set number of cells
> I left the X Y degrees alone and put the 106.7 for the X and 104.5
> for Y said OK
>
> Now not all the grids are the same size exactly..... they vary from 10.06
> to 10.94 sqmi.
> Depending on how accurate you really need to be ......... this may be a
> quick way to set it up.
>
> Now if you want a grid of 5 miles by 5 miles (25 sqmi) just change the
> numbers above and do the math.
>
> Chris Wagner
>
>
>
>
>
> debdemoe wrote:
> Hi! I need to cover my North Wisconsin map with a grid made with
> "blocks" of 10 sq miles each. I'm trying to use the Create Vector
> Grid, but so far no success. I know my latitude, longitude origin
> points, but I don't know where to specify that I want a grid spacing
> of 5 MILES.
>
> I appreciate any help.
>
> Thanks
>
>
>
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Stewart J. Berry (BSc, MSc)
GIS Specialist
E-mail: [EMAIL PROTECTED]
Phone: 617-527-4700
Fax: 617-527-5113
Caliper Corporation
1172 Beacon Street, Newton, MA, 02461-9926, USA
Web site: http://www.caliper.com
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