Hi All
I desperately need help. I see that my old Posting has been closed.
I need to convert from any Coordinade system to Lats\Longs and back again.
I have looked at Spatialite, but don't have a clue what is going on there...I think old-age is making me stupid.
Here is my code, which is a Class:
I desperately need help. I see that my old Posting has been closed.
I need to convert from any Coordinade system to Lats\Longs and back again.
I have looked at Spatialite, but don't have a clue what is going on there...I think old-age is making me stupid.
Here is my code, which is a Class:
B4X:
[/
Sub Class_Globals
Private Spa As Spatialite_Database
' Dim PI As Double = 3.1415926535897932385
' Dim RADIAN As Double = 2.0 * PI / 360
'
' Dim Local_srid As String
'Dim Data_File As String
Dim spconstants As Spatialite_Constants
' Initialize(File.DirRootExternal & "/CEASER/Data/" ,Data_File,"READONLY")
' Spa.Open(File.DirInternal, "mm.sqlite", spconstants.SQLITE_OPEN_READONLY)
End Sub
Public Sub Initialize '(DPATH As String ,DBASE As String , OPEN_STYLE As String)
Dim DPath, DBase, Open_Style As String
Spa.Initialize
DPath=File.DirRootExternal & "/CEASER/Data"
DBase="Projections.csv"
'File looks like this:
'EPSG Continent Country Grid
'5825 Oceania AU-CT AGD66 / ACT Standard Grid
'20249 Oceania AU-#M AGD66 / AMG zone 49
'20250 Oceania AU-#M AGD66 / AMG zone 50
Open_Style="ReadOnly"
'Initialize(DPath ,DBase,"READONLY")
Spa.Open(DPath, DBase, spconstants.SQLITE_OPEN_READONLY)
Select Open_Style
Case "READWRITE"
Spa.Open(DPath, DBase, spconstants.SQLITE_OPEN_READWRITE)
Case "READONLY"
Spa.Open(DPath, DBase, spconstants.SQLITE_OPEN_READONLY)
End Select
End Sub
Sub Get_point_from_local( X As Double , Y As Double) As String
Dim sqStm As Spatialite_TableResult
Dim result As String
Dim sql1 As String
sql1 = "SELECT ST_AsText(ST_Transform(ST_GeomFromText('POINT("
sql1 = sql1 & X & " " & Y & ")'," & CGlobals.EPSG & "),4326)) As trans_geom;"
'Globals.EPSG =2048
Try
sqStm = Spa.GetTable(sql1)
result = sqStm.Rows(0,0)
Catch
Log(LastException.Message)
MsgboxAsync(LastException.Message & CRLF & "Wrong EPSG code" ,"ATTENTION")
'Local_srid="2048"
Return "0000000000000000000"
End Try
If result=Null Or result="" Then
Return "0000000000000000000"
End If
Return result
End Sub
'''transform lat lon to local
Sub Get_point_to_Local( lat As Double , lon As Double) As String
Dim sqStm As Spatialite_TableResult
Dim result As String
Dim sql1 As String
sql1 = "SELECT ST_AsText(ST_Transform(ST_GeomFromText('POINT("
sql1 = sql1 & lon & " " & lat & ")',4326),"
sql1 = sql1 & CGlobals.EPSG & ")) As trans_geom;"
sqStm = Spa.GetTable(sql1)
result = sqStm.Rows(0,0)
Return result
End Sub
]
