Hatching Large Irregular Polygons for Geology Map

[JonMulder]

I'm creating a geologic map by hatching in the polygons created after doing topology. My preferred Hatch Pattern is SOLID. Sometime, however, particularly with very large convoluted polygons, the SOLID Hatch Pattern will not fill the entire polygon -- only filling part of it. I can go in to Properties, change the pattern to ANSI31 and change scale to around 100 or more and the hatch now covers the entire polygon.
Why doesn't the SOLID Hatch Pattern work? A work-around is to split the polygon in 2, but that involves redoing map cleanup and topology.
Any suggested Hatch Patterns for large polygons? I considered CROSS at a scale of ~200 and that gives a subdued color in the polygon. It's OK but not my preference.

[Anonymous]

Hi Jon,

Sounds like you have an interesting problem here.
Would you mind posting the DWG file to the customer files newsgroup, and I'll
take a look at it. Please zip the file and let us know when you have done
so.

Thanks,

David Walsh

Autodesk Map Product Design

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"JonMulder" <
href="mailto:mulder@water.ca.gov">mulder@water.ca.gov> wrote in message

href="news:f08f18f.-1@WebX.maYIadrTaRb">news:f08f18f.-1@WebX.maYIadrTaRb...

I'm
creating a geologic map by hatching in the polygons created after doing
topology. My preferred Hatch Pattern is SOLID. Sometime, however, particularly
with very large convoluted polygons, the SOLID Hatch Pattern will not fill the
entire polygon -- only filling part of it. I can go in to Properties, change
the pattern to ANSI31 and change scale to around 100 or more and the hatch now
covers the entire polygon.
   Why doesn't the SOLID Hatch
Pattern work? A work-around is to split the polygon in 2, but that involves
redoing map cleanup and topology.
   Any suggested Hatch
Patterns for large polygons? I considered CROSS at a scale of ~200 and that
gives a subdued color in the polygon. It's OK but not my
preference.

[Anonymous]

Have you tried setting up a query for the polygons and altering the
properties (apply the fills) during this process?

Bob

[Anonymous]

This is usually caused by large X/Y coordinates.
Try to move your origin closer to the hatched polygon - see
href="http://www.cadstudio.cz/tips">www.cadstudio.cz/tips

V.Michl, CAD Studio

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"JonMulder" <
href="mailto:mulder@water.ca.gov">mulder@water.ca.gov> wrote in message

href="news:f08f18f.-1@WebX.maYIadrTaRb">news:f08f18f.-1@WebX.maYIadrTaRb...

I'm
creating a geologic map by hatching in the polygons created after doing
topology. My preferred Hatch Pattern is SOLID. Sometime, however, particularly
with very large convoluted polygons, the SOLID Hatch Pattern will not fill the
entire polygon -- only filling part of it. I can go in to Properties, change
the pattern to ANSI31 and change scale to around 100 or more and the hatch now
covers the entire polygon.
   Why doesn't the SOLID Hatch
Pattern work? A work-around is to split the polygon in 2, but that involves
redoing map cleanup and topology.
   Any suggested Hatch
Patterns for large polygons? I considered CROSS at a scale of ~200 and that
gives a subdued color in the polygon. It's OK but not my
preference.

[aascheib]

Jon, I am interested in possibly discussing the creation of geology drawings in Map. We expect to get a project for digitizing geology drawings for the state. I just got Map 5 and I'm looking into the advantages of using it for the job, in which we currently plan to do heads-up digitizing, then port it to Arc/Info.
As for the hatching problem, just be glad you are trying it now. The more recent edge-finding algorithm works much better than earlier ones, per an Autodesk programmers who helped in writing the new one. Those wild funky shapes in geology maps push the hatching feature like crazy. Mercy.
My email: aascheib@bellatlantic.net

[Anonymous]

I have had this same problem with large convoluted solid hatch's,
especially when I am working with a large coordinate system far from the
0,0 origin. I would like to see a fix to this also.

JonMulder wrote:
>
> I'm creating a geologic map by hatching in the polygons created after
> doing topology. My preferred Hatch Pattern is SOLID. Sometime,
> however, particularly with very large convoluted polygons, the SOLID
> Hatch Pattern will not fill the entire polygon -- only filling part of
> it. I can go in to Properties, change the pattern to ANSI31 and change
> scale to around 100 or more and the hatch now covers the entire
> polygon.
> Why doesn't the SOLID Hatch Pattern work? A work-around is to split
> the polygon in 2, but that involves redoing map cleanup and topology.
> Any suggested Hatch Patterns for large polygons? I considered CROSS
> at a scale of ~200 and that gives a subdued color in the polygon. It's
> OK but not my preference.

[Anonymous]

You don't really have to change the origin -- just change "snapbase"
(type snapbase at the command line and pick somewhere near where you
are working). It's probably a good idea to reset it to 0,0
afterwards, but for maps you really don't use snap much, so you may
never notice the difference.

Michael Porter

Kim Woynowskie wrote:

>I have had this same problem with large convoluted solid hatch's,
>especially when I am working with a large coordinate system far from the
>0,0 origin. I would like to see a fix to this also.
>
>JonMulder wrote:
>>
>> I'm creating a geologic map by hatching in the polygons created after
>> doing topology. My preferred Hatch Pattern is SOLID. Sometime,
>> however, particularly with very large convoluted polygons, the SOLID
>> Hatch Pattern will not fill the entire polygon -- only filling part of
>> it. I can go in to Properties, change the pattern to ANSI31 and change
>> scale to around 100 or more and the hatch now covers the entire
>> polygon.
>> Why doesn't the SOLID Hatch Pattern work? A work-around is to split
>> the polygon in 2, but that involves redoing map cleanup and topology.
>> Any suggested Hatch Patterns for large polygons? I considered CROSS
>> at a scale of ~200 and that gives a subdued color in the polygon. It's
>> OK but not my preference.

Michael Porter Naval Architect / Boatbuilder
mporter at mp-marine dot com
Antispam -- make the obvious changes