Re: Dislocated Mercator Projection

Hi Don,

Perfect, I created mySpatialIndex with these ajustments and
everything is working fine.

Thanks a lot for your help.

Orlando

>From: Don Dietrick <dietrick@bbn.com>
>To: "orlando feitosa" <snapsurf@hotmail.com>
>CC: openmap-users@bbn.com
>Subject: Re: Dislocated Mercator Projection
>Date: Tue, 26 Mar 2002 15:47:23 -0500
>
>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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>
>
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>Don Dietrick, BBN Technologies, dietrick@bbn.com
>10 Moulton Street, Cambridge, MA 02138
>617-873-3031 [fax]-2794
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