Re: [OpenMap Users] stipes in layer...

Hi Martijn,

On Wednesday, October 23, 2002, at 06:27 AM, MARTIJN VAN DER PAUW
wrote:

> I do about the following.
>
> I put a OMGrid filled with a 2D array in a LocationLayer. There, I
> generate the grid with a slightly modified SimpleColorGenerator
> (SimpleColorGenerator gives same corrupt effect). I generate it with
> a Mercator Projection on the Netherlands (about
> 2degEast,50degNorth )
>
> Everytime a user requests an image, the grid size might be
> different. I seems that when the grid is square, there are no corrupt
> things in the image. I even think the corruptancy starts at the point
> the height or width is larger than its width,height.

Seems like this point is key. I'd focus on why this happens.

- Don

> -----------------------------------------------------------------------
> --------------------------
> The reason why I let the size of the grid differ is that it costs a lot
> less time to render.
> Otherwise, when I zoom in a lot, the render time is extremely long.
>
>
> Op 23 Oct 2002, om 7:49, Allan Doyle schreef:
>
>> On Wednesday, October 23 2002 at 07:16:01(+0200) MARTIJN VAN DER PAUW
>> wrote:
>>> Hello,
>>>
>>> I thought i send it before, but I couldn't find it back:
>>>
>>>
>>> Depending on the projection I use in the imageserver, I regurlarly
>> get > corrupte grid layers. The good looking grid stops somewhere, on
>> a > lat of > lon. The latest grid values stay in memory and those are
>> painted > over the > rest of the grid. example: >
>> http://www.regen.nl/temp/screendump21102002a.gif > > It seems to
>> depend on the lon/lat. In the example, when I move the > projection
>> more to the right, the disturbance starts earlier/later. > When
>> moving more to the north or south i get it at the right of > image as
>> well. It looks a bit like a method that's not ready while the > image
>> is already processed.
>>
>> This looks like a classic projection blow-up. We used to see it
>> horizontally when we first were developing the projections and
>> polygons would close the wrong way around the world or fly off to the
>> edge of the screen. I think the clues would be which projection you
>> are using and what the lat/lon values of the edges where it breaks
>> are.
>>
>> Maybe someone with better knowledge of the projection/generate code
>> would know where to look.
>>
>> Allan
>>
>> --
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> Allan Doyle http://www.intl-interfaces.com
>> adoyle@intl-interfaces.com
>>
>
>
>
>
> Martijn van der Pauw, internetontwikkelaar.
> Meteo Consult
> martijn@weer.nl
> tel: 0317 - 399800
> fax: 0317 - 423164
> http://www.weer.nl
>
> --
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>
>

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Don Dietrick, BBN Technologies, dietrick@bbn.com
10 Moulton Street, Cambridge, MA 02138
617-873-3031 [fax]-2794
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