Re: Dislocated Mercator Projection

Hi Orlando,

It looks like the creation of the spatial index file is completely
controlled by methods within SpatialIndex class. For instance, in the
SpatialIndex.indexPolygons() method, the writeLEDouble() methods are
writing out the coordinates that it finds in the shape file. You should
modify those calls so that the decimal degree values are written out, as
opposed to the DMS values.

- Don

On Monday, March 25, 2002, at 01:19 PM, orlando feitosa wrote:

> Thanks again Don.
>
> You are completely right, the problem is related to the SpatialIndex, I
> tried to remake the index file (*.ssx), but I could noticed that, the
> index file records does not changed.
>
> Probably, the program SpatialIndex does not use the ESRYPoly.read
> method when it is creating the index file (*.ssx).
>
> I used the program SpatialIndex to list the index file records:
> ___________________________________________________________________
> # java -mx64m com.bbn.openmap.layer.shape.SpatialIndex -d -b
> pc_osasc.ssx
>
> Record 1: 50, 80; -46.770224999999996, -23.549671999999997,
> -46.769557999999996, -23.549376
> Record 2: 134, 200; -46.772099999999995, -23.548273,
> -46.770869999999995, -23.546591
> Record 3: 338, 224; -46.784279999999995, -23.492839999999998,
> -46.781347, -23.491882
> _____________________________________________________________________
> Looking at the above coordinates LAT/LON, It seems they were not
> recalculated by ERSIPoly.read method.
>
> These are the DEBUG information at Scale=300.000
> ________________________________________________________________________
> PraÁas de Osasco|ShapeLayer.ShapeWorker.construct(): fetched 0 graphics
> in 0.44 seconds
> PraÁas de Osasco|ShapeLayer.ShapeWorker.construct(): getting graphics...
> locateRecords:
> xmin: -46.73527145385742; ymin: -23.454090118408203
> xmax: -46.15871810913086; ymax: -23.237815856933594
> Processed 106 records
> Selected 0 records
> PraÁas de Osasco|ShapeLayer.ShapeWorker.construct(): fetched 0 graphics
> in 0.33 seconds
> ShapeLayer.paint(): 0 omg shadow=0,0
> ShapeLayer.paint(): done
> ________________________________________________________________________
>
> These are the DEBUG information at Scale=600.000
> ________________________________________________________________________
> PraÁas de Osasco|ShapeLayer.ShapeWorker.construct(): getting graphics...
> locateRecords:
> xmin: -47.02354049682617; ymin: -23.56209373474121
> xmax: -45.87044906616211; ymax: -23.129545211791992
> going to shp byteOffset = 100 for record size = 168, offset = 50, shape
> type = 5
> going to shp byteOffset = 268 for record size = 408, offset = 134,
> shape type = 5
> .
> .
> .going to shp byteOffset = 32300 for record size = 696, offset = 16150,
> shape type = 5
> Processed 106 records
> Selected 98 records
> PraÁas de Osasco|ShapeLayer.ShapeWorker.construct(): fetched 98
> graphics in 12.74 seconds
> ShapeLayer.paint(): 98 omg shadow=0,0
> ShapeLayer.paint(): done
> ________________________________________________________________________
>
> What do you think Don ?
> Thanks for everything.
> Orlando
>
>
>
>> From: Don Dietrick <dietrick@bbn.com>
>> To: "orlando feitosa" <snapsurf@hotmail.com>
>> CC: openmap-users@bbn.com
>> Subject: Re: Dislocated Mercator Projection
>> Date: Sun, 24 Mar 2002 18:34:29 -0500
>>
>> Hi Orlando,
>>
>> You might want to run OpenMap with a -Ddebug.shape java flag set to
>> let the shape layer print out what it thinks is going on.
>>
>> The ShapeLayer uses a SpatialIndex file that it creates (.ssx), to let
>> it know the bounding box rectangles for each graphic. The DMS
>> coordinates of the shape file may be affecting what gets displayed on
>> the screen at that scale. You might have to (delete and) remake the
>> ssx file.
>>
>> - Don
>>
>> On Sunday, March 24, 2002, at 01:57 PM, orlando feitosa wrote:
>>
>>> Hi Don,
>>>
>>> Thanks for your help, I changed the original ESRIPoly.read method
>>> before the degToRad call, to the following:
>>>
>>> radians[i+1] = ((float)readLEDouble(b, ptr));//x (lon)
>>> aux = ((int) radians[i+1]);
>>> radians[i+1] = ((((radians[i+1] - aux) * 60) / 100) +
>>> aux);
>>> // System.out.println("LON: " + radians[i+1]);
>>> radians[i+1] = ProjMath.degToRad((float)radians[i+1]);
>>> ptr += 8;
>>>
>>> radians[i] = ((float)readLEDouble(b, ptr));//y (lat)
>>> aux = ((int) radians[i]);
>>> radians[i] = ((((radians[i] - aux) * 60) / 100) + aux);
>>> // System.out.println("LAT: " + radians[i]);
>>> radians[i] = ProjMath.degToRad((float)radians[i]);
>>> ptr += 8;
>>>
>>> and the map projection appears in right coordinates, SOLVING the
>>> problem with all my Shapefiles, but another problem begun related to
>>> the SCALES.
>>> When the scale is around 600,000 or greater (Zoom out) the Map is
>>> displayed on the screen correctly, but when I try to Zoom in the
>>> projection, the Map just disappears from the screen.
>>> I tried to find other related classes or methods involved with this
>>> change, but I havenÌt any success.
>>> Do you have an idea how to solve the new problem?
>>>
>>> Thank you so much for attention.
>>>
>>> Best Regards.
>>>
>>> Orlando
>>>
>>>
>>>
>>>> From: Don Dietrick <dietrick@bbn.com>
>>>> To: "orlando feitosa" <snapsurf@hotmail.com>
>>>> CC: openmap-users@bbn.com
>>>> Subject: Re: Dislocated Mercator Projection
>>>> Date: Mon, 18 Mar 2002 19:25:12 -0500
>>>>
>>>> Hi Orlando,
>>>>
>>>> If that is the problem, then you can make some modifications to the
>>>> shape layer package code that reads the data files, and modify them
>>>> before they are used to create OMGraphics. For the
>>>> com.bbn.openmap.layer.shape package, you can look in the
>>>> ESRIPoly.read method, making the modifications before the degToRad()
>>>> call (and so on, for each shape type you are trying to display).
>>>>
>>>> The com.bbn.openmap.DMSLatLonPoint could help you with the
>>>> conversion, but you'd have to do the parsing to load it properly,
>>>> and you'd also want to keep one in the ESRIPoly to reuse for every
>>>> coordinate, instead of allocating one for every coordinate.
>>>>
>>>> Hope this helps,
>>>>
>>>> Don
>>>>
>>>> On Monday, March 18, 2002, at 04:21 PM, orlando feitosa wrote:
>>>>
>>>>> Hi Don,
>>>>>
>>>>> Thanks for your answer, Iïm starting OpenMap with the scale=230.000
>>>>> and I tried to zoom in until scale=7.187 and zoom out until
>>>>> scale=920.000, but the dislocation of the map as whole keeps the
>>>>> same.
>>>>>
>>>>> Talking with Mr.Alexander, he noticed the following:
>>>>> ___________________________________________________________________
>>>>> -23.576 --> -23 0.576*60 = -23 34.56
>>>>> -46.745 --> -46 0.745*60 = -46 44.7
>>>>>
>>>>> The guess was that you were trying to compare Lat, Lon in decimal
>>>>> degree with coordinates in Degree.Minute form. What I did is just
>>>>> converted fractional part of degree to minutes.
>>>>> Just double check this. Probably everything works fine and you
>>>>> don't need any correction
>>>>> ____________________________________________________________________
>>>>>
>>>>> ....the problem is that, I must do something!!!! I donït know where
>>>>> and how I can adjust the projection in the right coordinates (slide
>>>>> up the map).
>>>>>
>>>>> This information should helps, for each Shapefile *.shp there is a
>>>>> file called *.prj with following lines:
>>>>>
>>>>> &REM Clark 1866 Lat/Lon, Degrees, -180 ==> +180
>>>>> &REM LL
>>>>> PROJECTION GEOGRAPHIC
>>>>> UNITS DD
>>>>> PARAMETERS
>>>>>
>>>>> Thanks for any help.
>>>>>
>>>>> Best Regards,
>>>>>
>>>>> Orlando
>>>>>
>>>>>
>>>>>
>>>>>> From: Don Dietrick <dietrick@bbn.com>
>>>>>> To: "orlando feitosa" <snapsurf@hotmail.com>
>>>>>> CC: openmap-users@bbn.com
>>>>>> Subject: Re: Dislocated Mercator Projection
>>>>>> Date: Sun, 17 Mar 2002 16:06:33 -0500
>>>>>>
>>>>>> Hi Orlando,
>>>>>>
>>>>>> What scale is the map that you are looking at? Does the error
>>>>>> decrease
>>>>>> when you zoom in? You may be seeing the effects of rounding that
>>>>>> the
>>>>>> projection is doing at smaller scales, setting a pixel's
>>>>>> coordinates to
>>>>>> some value, while rounding other lat/lon values to that closest
>>>>>> pixel as
>>>>>> well.
>>>>>>
>>>>>> - Don
>>>>>>
>>>>>> On Saturday, March 16, 2002, at 10:50 PM, orlando feitosa wrote:
>>>>>>
>>>>>>> Hi Friends,
>>>>>>>
>>>>>>> I√m having a problem with the Mercator Projection, when a map (a
>>>>>>> Shapefile) is rendered using the ShapeLayer, all the projection
>>>>>>> appears dislocated in a wrong LAT/LON coordinates.
>>>>>>>
>>>>>>> Here are differences in a specific coordinate:
>>>>>>>
>>>>>>> Wrong Projection Should be Difference in Decimal Degrees
>>>>>>> LAT -23.576 -23.346 -230
>>>>>>> LON -46.745 -46.445 -300
>>>>>>>
>>>>>>> Is there a kind of adjustment parameter to setup this dislocation?
>>>>>>>
>>>>>>> I√ll appreciate any help.
>>>>>>>
>>>>>>> Best Regards,
>>>>>>>
>>>>>>> Orlando
>>>>>>>
>>>>>>>
>>>>>>> _________________________________________________________________
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>>>>>>>
>>>>>>>
>>
>>
>> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>> Don Dietrick, dietrick@bbn.com
>> BBN Technologies, Cambridge, MA
>> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>>>>>>
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>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _________________________________________________________________
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>>>>
>>>
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>
>
>
>
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Don Dietrick, BBN Technologies, dietrick@bbn.com
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