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IDTM Projection Parameters

The following table lists the commonly-used projection parameters for Idaho GIS data. In addition to the data below, please review the ITA Projection Standard (S4210).

 Idaho Transverse Mercator (IDTM83)Albers Equal AreaLambert Conformal ConicUniversal Transverse Mercator, Zone 11Universal Transverse Mercator, Zone 12Idaho Transverse Mercator (IDTM27)
Projection NamePROJECTION TRANSVERSEPROJECTION ALBERSPROJECTION LAMBERTPROJECTION UTMPROJECTION UTMPROJECTION TRANSVERSE
UnitsMETERSMETERSMETERSMETERSMETERSMETERS
ZoneZone 11Zone 12
DatumDATUM NAD83DATUM NAD27DATUM NAD27DATUM NAD27
Projection specific parameter valuesPARAMETERSPARAMETERSPARAMETERSPARAMETERS
1st standard parallel43 30 0033 00 00
2nd standard parallel47 30 0045 00 00
Scale factor at central meridian0.0999600.99960
Central meridian-114 00 00-114 00 00-114 00 00-114 00 00
Latitude of origin42 00 0041 45 0042 00 0042 00 00
False easing2,500,0000.00500,000
False northing1,200,0000.00100,000
Vertical DatumNAVD88
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