Re: Upper and Lower Latitudes ...

Hello Don,

I had the foll. change in the openmap.properties file for
mercator:
openmap.Width=640
openmap.Height=640

This only increased the span to 80/-80 for center 0,0.

Don, when you increased the height did you resize the window
by pulling the upper edge. The only way I get a 90/-90 in
other words a complete 180 degrees span for the latitudes if
I resize the window like that. But that certainly seems that
users with smaller size monitors would find this an inhibition,
for the resize buttons and the widgets would be cut off when
they do that, I have this problem !

Also, the track on using ProjMath.getScale() is related to
this. I have attached the source and class files for the DemoLayer.java with some changes to illustrate the point. Whats changed there is a set of BitMaps are created and put into the GraphicList based on hard coded lat/lon values, when a timer
expires it calls the MAX/MIN of these lat/lon, determines a
bounding box and then the scale using ProjMath.getScale() and
then recenters the map.

The behaviour seen is that the latitudes span the box had does
not match what should appear.

Could you please test this if you can spare a moment. I would
like to know if I have missed any detail or if there is some
feature problem or restriction.

Thanks,
Pradeep.

--
On Thu, 6 Sep 2001 15:44:16   
 Donald Dietrick wrote:
>OK, now I'm lost.  I'm not sure what the question is, I guess.  For me, 
>the mercator projection is stretching 360 degrees across, with the 
>latitude span limited by the height of the window.  The CADRG projection 
>doesn't stretch 360 degrees unless the width of the window is big 
>enough, but the latitude span works the same way (depends on the height 
>of the window).
>
>- Don
>
>
>
>On Thursday, September 6, 2001, at 01:04 PM, PRADEEP RAMACHANDRAN wrote:
>
>> No Don ... the Mercator isn't working that way , its the
>> behaviour with Mercator that I was mentioning about when
>> I try and change the window dimensions to square like ...
>>
>> With CADRG the areas covered with a sqaure-like dimension
>> appear to be lesser ...
>>
>>
>> --
>>
>> On Thu, 6 Sep 2001 11:59:38
>>  Donald Dietrick wrote:
>>> Hi Pradeep,
>>>
>>> On Thursday, September 6, 2001, at 11:12 AM, PRADEEP RAMACHANDRAN 
>>> wrote:
>>>
>>>> Thanks Don,
>>>>
>>>> But isn't the Viewer app showing 360 degrees across ?
>>>
>>> I would have expected it to, but upon looking into it, the CADRG
>>> projection min scale is limited to a pixel ratio.  I can't remember why
>>> it's written differently than the Mercator projection, but think it has
>>> to do with the CADRG projection being pixel/degree based, and those
>>> ratios are specified in the RPF specification.  It was written to
>>> support RPF raster charts, so probably wasn't intended to provide a
>>> whole earth look.
>>>
>>>> And by trying to make the window square like it, assumes
>>>> more of the look CADRG projection for the default height, width
>>>> for the viewer app, even lesser area appears to be covered ?
>>>
>>> But the mercator projection is working as expected, no?
>>>
>>> - Don
>>>
>>>
>>>
>>>>
>>>> Regards,
>>>> Pradeep.
>>>>
>>>> --
>>>>
>>>> On Thu, 6 Sep 2001 10:40:32
>>>>  Donald Dietrick wrote:
>>>>> Hi Predeep,
>>>>>
>>>>> The upper/lower bounding that you are seeing may be a result of the
>>>>> projections limiting the minimum scale to whatever allows only 360
>>>>> degrees across the map window.  If you make the window more
>>>>> square-like,
>>>>> more of the latitudes will appear.
>>>>>
>>>>> - Don
>>>>>
>>>>> On Wednesday, September 5, 2001, at 09:34 AM, PRADEEP RAMACHANDRAN
>>>>> wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> The differene between the upper and lower latitudes for
>>>>>> both Mercator and CADRG projections seem restricted to
>>>>>> be within a certain range viz., approximately 135 degrees,
>>>>>> with the min. scale.
>>>>>>
>>>>>> To simulate this the map center for the OpenMap viewer
>>>>>> application was set to 0,0. The upper/lower bounding
>>>>>> latitudes for the min scale ( 207,476,976 for Mercator and 
>>>>>> 389,940,928
>>>>>> for CADRG ) were less than 70/-70 respectively.
>>>>>>
>>>>>> Is this the normal behaviour for OpenMap ?
>>>>>>
>>>>>> Regards,
>>>>>> Pradeep.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Get 250 color business cards for FREE!
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>>>>>> --
>>>>>> [To unsubscribe to this list send an email to "majdart@bbn.com"
>>>>>> with the following text in the BODY of the message "unsubscribe
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>>>>>>
>>>>>
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>Donald F. Dietrick, dietrick@bbn.com
>BBN Technologies, 10 Moulton Street, Cambridge, MA 02138
>617.873.3031 FAX 2794
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>>>>>
>>>>
>>>>
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>>>>
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>>>> [To unsubscribe to this list send an email to "majdart@bbn.com"
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>>>>
>>> --
>>> [To unsubscribe to this list send an email to "majdart@bbn.com"
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>>
>>
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>>
>
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