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Description: comment:Longitude is referenced to the Paris meridian. The conversion method is a good approximation (better than 5cm) to original formula (see proj code 19861) within a few hundred km of origin, but farther away the approximation may be no better than 1m.

PropertyValue
accuracy-1.0 (xmls:double)
area_of_useMadagascar - onshore and nearshore. (geoepsg:Laborde_Grid_approximation_area_of_use)
asProj4
  • +proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=grad +xy_out=rad +step +inv +proj=longlat +ellps=intl +pm=paris +step +p (...)roj=omerc +lat_0=-18.9 +lonc=44.1 +alpha=18.9 +gamma=18.9 +k=0.9995 +x_0=400000 +y_0=800000 +ellps=intl +pm=paris
    (geocrs:projLiteral)
  • +proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=grad +xy_out=rad +step +inv +proj=longlat +ellps=intl +pm=paris +step +p (...)roj=omerc +lat_0=-18.9 +lonc=44.1 +alpha=18.9 +gamma=18.9 +k=0.9995 +x_0=400000 +y_0=800000 +ellps=intl +pm=paris +step +proj=axisswap +order=2,1
    (geocrs:projLiteral)
asProjJSON
{'$schema':'https://proj.org/schemas/v0.2/projjson.schema.json','type':'Conversion','name':'Laborde Grid approximation','method':{'name':'Hotine Obliq (...)ue Mercator (variant B)','id':{'authority':'EPSG','code':9815}},'parameters':[{'name':'Latitude of projection centre','value':-21,'unit':{'type':'AngularUnit','name':'grad','conversion_factor':0.0157079632679489},'id':{'authority':'EPSG','code':8811}},{'name':'Longitude of projection centre','value':49,'unit':{'type':'AngularUnit','name':'grad','conversion_factor':0.0157079632679489},'id':{'authority':'EPSG','code':8812}},{'name':'Azimuth of initial line','value':21,'unit':{'type':'AngularUnit','name':'grad','conversion_factor':0.0157079632679489},'id':{'authority':'EPSG','code':8813}},{'name':'Angle from Rectified to Skew Grid','value':21,'unit':{'type':'AngularUnit','name':'grad','conversion_factor':0.0157079632679489},'id':{'authority':'EPSG','code':8814}},{'name':'Scale factor on initial line','value':0.9995,'unit':'unity','id':{'authority':'EPSG','code':8815}},{'name':'Easting at projection centre','value':400000,'unit':'metre','id':{'authority':'EPSG','code':8816}},{'name':'Northing at projection centre','value':800000,'unit':'metre','id':{'authority':'EPSG','code':8817}}],'id':{'authority':'EPSG','code':19911}}
(geocrs:projJSONLiteral)
asWKT
CONVERSION['Laborde Grid approximation',METHOD['Hotine Oblique Mercator (variant B)',ID['EPSG',9815]],PARAMETER['Latitude of projection centre',-21,AN (...)GLEUNIT['grad',0.0157079632679489],ID['EPSG',8811]],PARAMETER['Longitude of projection centre',49,ANGLEUNIT['grad',0.0157079632679489],ID['EPSG',8812]],PARAMETER['Azimuth of initial line',21,ANGLEUNIT['grad',0.0157079632679489],ID['EPSG',8813]],PARAMETER['Angle from Rectified to Skew Grid',21,ANGLEUNIT['grad',0.0157079632679489],ID['EPSG',8814]],PARAMETER['Scale factor on initial line',0.9995,SCALEUNIT['unity',1],ID['EPSG',8815]],PARAMETER['Easting at projection centre',400000,LENGTHUNIT['metre',1],ID['EPSG',8816]],PARAMETER['Northing at projection centre',800000,LENGTHUNIT['metre',1],ID['EPSG',8817]],ID['EPSG',19911]]
(geocrs:wktLiteral)
has_ballpark_transformationfalse (xmls:boolean)
method_nameHotine Oblique Mercator (variant B) (xsd:string)
parameter
7 values
usageTopographic mapping (medium scale) (xmls:string)
type (rdf:type) longitude latitude projection (geoepsg:LonLatProjection)
comment (rdfs:comment)
Longitude is referenced to the Paris meridian. The conversion method is a good approximation (better than 5cm) to original formula (see proj code 1986 (...)1) within a few hundred km of origin, but farther away the approximation may be no better than 1m.
(xmls:string)
label (rdfs:label) Laborde Grid approximation: Hotine Oblique Mercator (variant B) (rdf:langString) (iso6391:en)
Is coordinate operation of
Metadata
PropertyValue
inDataset (void:inDataset) geoepsg_dataset (geoepsg:geoepsg_dataset) [466048 geocrs:PlanarCoordinateSystem]