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-rw-r--r--src/iso19111/io.cpp2
-rw-r--r--src/iso19111/operation/conversion.cpp24
-rw-r--r--src/iso19111/operation/esriparammappings.cpp31
-rw-r--r--src/iso19111/operation/parammappings.cpp6
-rw-r--r--src/proj_constants.h3
-rw-r--r--src/projections/adams.cpp139
6 files changed, 179 insertions, 26 deletions
diff --git a/src/iso19111/io.cpp b/src/iso19111/io.cpp
index ca5a3d97..fc92dbbd 100644
--- a/src/iso19111/io.cpp
+++ b/src/iso19111/io.cpp
@@ -10209,6 +10209,8 @@ PROJStringParser::Private::buildProjectedCRS(int iStep,
}
} else if (param->unit_type == UnitOfMeasure::Type::SCALE) {
value = 1;
+ } else if (step.name == "peirce_q" && proj_name == "lat_0") {
+ value = 90;
}
PropertyMap propertiesParameter;
diff --git a/src/iso19111/operation/conversion.cpp b/src/iso19111/operation/conversion.cpp
index 77e703f3..6bccf182 100644
--- a/src/iso19111/operation/conversion.cpp
+++ b/src/iso19111/operation/conversion.cpp
@@ -3839,6 +3839,30 @@ void Conversion::_exportToPROJString(
formatter->addParam("x_0", falseEasting);
formatter->addParam("y_0", falseNorthing);
bConversionDone = true;
+ } else if (ci_equal(methodName,
+ PROJ_WKT2_NAME_METHOD_PEIRCE_QUINCUNCIAL_SQUARE) ||
+ ci_equal(methodName,
+ PROJ_WKT2_NAME_METHOD_PEIRCE_QUINCUNCIAL_DIAMOND)) {
+ const auto &scaleFactor = parameterValueMeasure(
+ EPSG_CODE_PARAMETER_SCALE_FACTOR_AT_NATURAL_ORIGIN);
+ if (scaleFactor.unit().type() != common::UnitOfMeasure::Type::UNKNOWN &&
+ std::fabs(scaleFactor.getSIValue() - 1.0) > 1e-10) {
+ throw io::FormattingException(
+ "Only scale factor = 1 handled for Peirce Quincuncial");
+ }
+ const double latitudeOfOriginDeg =
+ parameterValue(EPSG_CODE_PARAMETER_LATITUDE_OF_NATURAL_ORIGIN)
+ ->value()
+ .unit()
+ .type() != common::UnitOfMeasure::Type::UNKNOWN
+ ? parameterValueNumeric(
+ EPSG_CODE_PARAMETER_LATITUDE_OF_NATURAL_ORIGIN,
+ common::UnitOfMeasure::DEGREE)
+ : 90.0;
+ if (std::fabs(latitudeOfOriginDeg - 90.0) > 1e-10) {
+ throw io::FormattingException("Only latitude of natural origin = "
+ "90 handled for Peirce Quincuncial");
+ }
} else if (formatter->convention() ==
io::PROJStringFormatter::Convention::PROJ_5 &&
isZUnitConversion) {
diff --git a/src/iso19111/operation/esriparammappings.cpp b/src/iso19111/operation/esriparammappings.cpp
index 8021b95f..a6f6c6a1 100644
--- a/src/iso19111/operation/esriparammappings.cpp
+++ b/src/iso19111/operation/esriparammappings.cpp
@@ -947,6 +947,33 @@ static const ESRIParamMapping paramsESRI_Equal_Earth[] = {
EPSG_CODE_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN, "0.0", false},
{nullptr, nullptr, 0, "0.0", false}};
+static const ESRIParamMapping paramsESRI_Peirce_Quincuncial_alt1[] = {
+ {"False_Easting", EPSG_NAME_PARAMETER_FALSE_EASTING,
+ EPSG_CODE_PARAMETER_FALSE_EASTING, "0.0", false},
+ {"False_Northing", EPSG_NAME_PARAMETER_FALSE_NORTHING,
+ EPSG_CODE_PARAMETER_FALSE_NORTHING, "0.0", false},
+ {"Central_Meridian", EPSG_NAME_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN,
+ EPSG_CODE_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN, "0.0", false},
+ {"Scale_Factor", EPSG_NAME_PARAMETER_SCALE_FACTOR_AT_NATURAL_ORIGIN,
+ EPSG_CODE_PARAMETER_SCALE_FACTOR_AT_NATURAL_ORIGIN, "0.0", false},
+ {"Latitude_Of_Origin", EPSG_NAME_PARAMETER_LATITUDE_OF_NATURAL_ORIGIN,
+ EPSG_CODE_PARAMETER_LATITUDE_OF_NATURAL_ORIGIN, "0.0", false},
+ {"Option", nullptr, 0, "0.0", false},
+ {nullptr, nullptr, 0, "0.0", false}};
+static const ESRIParamMapping paramsESRI_Peirce_Quincuncial_alt2[] = {
+ {"False_Easting", EPSG_NAME_PARAMETER_FALSE_EASTING,
+ EPSG_CODE_PARAMETER_FALSE_EASTING, "0.0", false},
+ {"False_Northing", EPSG_NAME_PARAMETER_FALSE_NORTHING,
+ EPSG_CODE_PARAMETER_FALSE_NORTHING, "0.0", false},
+ {"Central_Meridian", EPSG_NAME_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN,
+ EPSG_CODE_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN, "0.0", false},
+ {"Scale_Factor", EPSG_NAME_PARAMETER_SCALE_FACTOR_AT_NATURAL_ORIGIN,
+ EPSG_CODE_PARAMETER_SCALE_FACTOR_AT_NATURAL_ORIGIN, "0.0", false},
+ {"Latitude_Of_Origin", EPSG_NAME_PARAMETER_LATITUDE_OF_NATURAL_ORIGIN,
+ EPSG_CODE_PARAMETER_LATITUDE_OF_NATURAL_ORIGIN, "0.0", false},
+ {"Option", nullptr, 0, "1.0", false},
+ {nullptr, nullptr, 0, "0.0", false}};
+
static const ESRIMethodMapping esriMappings[] = {
{"Plate_Carree", EPSG_NAME_METHOD_EQUIDISTANT_CYLINDRICAL,
EPSG_CODE_METHOD_EQUIDISTANT_CYLINDRICAL, paramsESRI_Plate_Carree},
@@ -1115,6 +1142,10 @@ static const ESRIMethodMapping esriMappings[] = {
EPSG_CODE_METHOD_COLOMBIA_URBAN, paramsESRI_IGAC_Plano_Cartesiano},
{"Equal_Earth", EPSG_NAME_METHOD_EQUAL_EARTH, EPSG_CODE_METHOD_EQUAL_EARTH,
paramsESRI_Equal_Earth},
+ {"Peirce_Quincuncial", PROJ_WKT2_NAME_METHOD_PEIRCE_QUINCUNCIAL_SQUARE, 0,
+ paramsESRI_Peirce_Quincuncial_alt1},
+ {"Peirce_Quincuncial", PROJ_WKT2_NAME_METHOD_PEIRCE_QUINCUNCIAL_DIAMOND, 0,
+ paramsESRI_Peirce_Quincuncial_alt2},
};
// ---------------------------------------------------------------------------
diff --git a/src/iso19111/operation/parammappings.cpp b/src/iso19111/operation/parammappings.cpp
index af1309b3..dd94e267 100644
--- a/src/iso19111/operation/parammappings.cpp
+++ b/src/iso19111/operation/parammappings.cpp
@@ -793,6 +793,12 @@ static const MethodMapping projectionMethodMappings[] = {
{PROJ_WKT2_NAME_METHOD_ROBINSON, 0, "Robinson", "robin", nullptr,
paramsLonNatOriginLongitudeCentre},
+ {PROJ_WKT2_NAME_METHOD_PEIRCE_QUINCUNCIAL_SQUARE, 0, nullptr, "peirce_q",
+ "shape=square", paramsNatOriginScale},
+
+ {PROJ_WKT2_NAME_METHOD_PEIRCE_QUINCUNCIAL_DIAMOND, 0, nullptr, "peirce_q",
+ "shape=diamond", paramsNatOriginScale},
+
{PROJ_WKT2_NAME_METHOD_SINUSOIDAL, 0, "Sinusoidal", "sinu", nullptr,
paramsLonNatOriginLongitudeCentre},
diff --git a/src/proj_constants.h b/src/proj_constants.h
index 815511fe..1da63474 100644
--- a/src/proj_constants.h
+++ b/src/proj_constants.h
@@ -248,6 +248,9 @@
#define EPSG_CODE_METHOD_COLOMBIA_URBAN 1052
#define EPSG_NAME_METHOD_COLOMBIA_URBAN "Colombia Urban"
+#define PROJ_WKT2_NAME_METHOD_PEIRCE_QUINCUNCIAL_SQUARE "Peirce Quincuncial (Square)"
+#define PROJ_WKT2_NAME_METHOD_PEIRCE_QUINCUNCIAL_DIAMOND "Peirce Quincuncial (Diamond)"
+
/* ------------------------------------------------------------------------ */
/* Projection parameters */
diff --git a/src/projections/adams.cpp b/src/projections/adams.cpp
index 4150fff2..b0c2849c 100644
--- a/src/projections/adams.cpp
+++ b/src/projections/adams.cpp
@@ -60,7 +60,7 @@ enum projection_type {
ADAMS_WS2,
};
-enum peirce_type {
+enum peirce_shape {
PEIRCE_Q_SQUARE,
PEIRCE_Q_DIAMOND,
PEIRCE_Q_NHEMISPHERE,
@@ -71,7 +71,7 @@ enum peirce_type {
struct pj_opaque {
projection_type mode;
- peirce_type pqtype;
+ peirce_shape pqshape;
double scrollx = 0.0;
double scrolly = 0.0;
};
@@ -143,13 +143,13 @@ static PJ_XY adams_forward(PJ_LP lp, PJ *P) {
break;
case PEIRCE_Q: {
/* lam0 - note that the original Peirce model used a central meridian of around -70deg, but the default within proj is +lon0=0 */
- if (Q->pqtype == PEIRCE_Q_NHEMISPHERE) {
+ if (Q->pqshape == PEIRCE_Q_NHEMISPHERE) {
if( lp.phi < -TOL ) {
proj_errno_set(P, PROJ_ERR_COORD_TRANSFM_OUTSIDE_PROJECTION_DOMAIN);
return proj_coord_error().xy;
}
}
- if (Q->pqtype == PEIRCE_Q_SHEMISPHERE) {
+ if (Q->pqshape == PEIRCE_Q_SHEMISPHERE) {
if( lp.phi > -TOL ) {
proj_errno_set(P, PROJ_ERR_COORD_TRANSFM_OUTSIDE_PROJECTION_DOMAIN);
return proj_coord_error().xy;
@@ -211,7 +211,7 @@ static PJ_XY adams_forward(PJ_LP lp, PJ *P) {
constexpr double shd = 1.8540746773013719 * 2;
/* For square and diamond Quincuncial projections, spin out southern hemisphere to triangular segments of quincunx (before rotation for square)*/
- if( Q->pqtype == PEIRCE_Q_SQUARE || ( Q->pqtype == PEIRCE_Q_DIAMOND )) {
+ if( Q->pqshape == PEIRCE_Q_SQUARE || ( Q->pqshape == PEIRCE_Q_DIAMOND )) {
if (lp.phi < 0.) { /* fold out segments */
if (lp.lam < ( -0.75 * M_PI )) xy.y = shd - xy.y; /* top left segment, shift up and reflect y */
if ( (lp.lam < (-0.25 * M_PI)) && (lp.lam >= ( -0.75 * M_PI ))) xy.x = - shd - xy.x; /* left segment, shift left and reflect x */
@@ -222,20 +222,20 @@ static PJ_XY adams_forward(PJ_LP lp, PJ *P) {
}
/* For square types rotate xy by 45 deg */
- if( Q->pqtype == PEIRCE_Q_SQUARE ) {
+ if( Q->pqshape == PEIRCE_Q_SQUARE ) {
const double temp = xy.x;
xy.x = RSQRT2 * (xy.x - xy.y);
xy.y = RSQRT2 * (temp + xy.y);
}
/* For rectangle Quincuncial projs, spin out southern hemisphere to east (horizontal) or north (vertical) after rotation */
- if( Q->pqtype == PEIRCE_Q_HORIZONTAL ) {
+ if( Q->pqshape == PEIRCE_Q_HORIZONTAL ) {
if (lp.phi < 0.) {
xy.x = shd - xy.x; /* reflect x to east */
}
xy.x = xy.x - (shd / 2); /* shift everything so origin is in middle of two hemispheres */
}
- if( Q->pqtype == PEIRCE_Q_VERTICAL ) {
+ if( Q->pqshape == PEIRCE_Q_VERTICAL ) {
if (lp.phi < 0.) {
xy.y = shd - xy.y; /* reflect y to north */
}
@@ -243,7 +243,7 @@ static PJ_XY adams_forward(PJ_LP lp, PJ *P) {
}
//if o_scrollx param present, scroll x
- if (!(Q->scrollx == 0.0) && (Q->pqtype == PEIRCE_Q_HORIZONTAL) ) {
+ if (!(Q->scrollx == 0.0) && (Q->pqshape == PEIRCE_Q_HORIZONTAL) ) {
double xscale = 2.0;
double xthresh = shd / 2;
xy.x = xy.x + (Q->scrollx * (xthresh * 2 * xscale)); /*shift relative to proj width*/
@@ -256,7 +256,7 @@ static PJ_XY adams_forward(PJ_LP lp, PJ *P) {
}
//if o_scrolly param present, scroll y
- if (!(Q->scrolly == 0.0) && (Q->pqtype == PEIRCE_Q_VERTICAL)) {
+ if (!(Q->scrolly == 0.0) && (Q->pqshape == PEIRCE_Q_VERTICAL)) {
double yscale = 2.0;
double ythresh = shd / 2;
xy.y = xy.y + (Q->scrolly * (ythresh * 2 * yscale)); /*shift relative to proj height*/
@@ -299,6 +299,91 @@ static PJ_LP adams_inverse(PJ_XY xy, PJ *P)
return pj_generic_inverse_2d(xy, P, lp);
}
+static PJ_LP peirce_q_square_inverse(PJ_XY xy, PJ *P)
+{
+ /* Heuristics based on trial and repeat process */
+ PJ_LP lp;
+ lp.phi = 0;
+ if( xy.x == 0 && xy.y < 0 )
+ {
+ lp.lam = -M_PI / 4;
+ if( fabs(xy.y) < 2.622057580396 )
+ lp.phi = M_PI / 4;
+ }
+ else if( xy.x > 0 && fabs(xy.y) < 1e-7 )
+ lp.lam = M_PI / 4;
+ else if( xy.x < 0 && fabs(xy.y) < 1e-7 )
+ {
+ lp.lam = -3 * M_PI / 4;
+ lp.phi = M_PI / 2 / 2.622057574224 * xy.x + M_PI / 2;
+ }
+ else if( fabs(xy.x) < 1e-7 && xy.y > 0 )
+ lp.lam = 3 * M_PI / 4;
+ else if( xy.x >= 0 && xy.y <= 0 )
+ {
+ lp.lam = 0;
+ if( xy.x == 0 && xy.y == 0 )
+ {
+ lp.phi = M_PI / 2;
+ return lp;
+ }
+ }
+ else if( xy.x >= 0 && xy.y >= 0 )
+ lp.lam = M_PI / 2;
+ else if( xy.x <= 0 && xy.y >= 0 )
+ {
+ if( fabs(xy.x) < fabs(xy.y) )
+ lp.lam = M_PI * 0.9;
+ else
+ lp.lam = -M_PI * 0.9;
+ }
+ else /* if( xy.x <= 0 && xy.y <= 0 ) */
+ lp.lam = -M_PI / 2;
+ return pj_generic_inverse_2d(xy, P, lp);
+}
+
+static PJ_LP peirce_q_diamond_inverse(PJ_XY xy, PJ *P)
+{
+ /* Heuristics based on a trial and repeat process */
+ PJ_LP lp;
+ lp.phi = 0;
+ if( xy.x >= 0 && xy.y <= 0 )
+ {
+ lp.lam = M_PI / 4;
+ if( xy.x > 0 && xy.y == 0 )
+ {
+ lp.lam = M_PI / 2;
+ lp.phi = 0;
+ }
+ else if( xy.x == 0 && xy.y == 0 )
+ {
+ lp.lam = 0;
+ lp.phi = M_PI / 2;
+ return lp;
+ }
+ else if( xy.x == 0 && xy.y < 0 )
+ {
+ lp.lam = 0;
+ lp.phi = M_PI / 4;
+ }
+ }
+ else if( xy.x >= 0 && xy.y >= 0 )
+ lp.lam = 3 * M_PI / 4;
+ else if( xy.x <= 0 && xy.y >= 0 )
+ {
+ lp.lam = -3 * M_PI / 4;
+ }
+ else /* if( xy.x <= 0 && xy.y <= 0 ) */
+ lp.lam = -M_PI / 4;
+
+ if( fabs(xy.x) > 1.8540746773013719 + 1e-3 ||
+ fabs(xy.y) > 1.8540746773013719 + 1e-3 )
+ {
+ lp.phi = -M_PI / 4;
+ }
+
+ return pj_generic_inverse_2d(xy, P, lp);
+}
static PJ *setup(PJ *P, projection_type mode) {
struct pj_opaque *Q = static_cast<struct pj_opaque*>(
@@ -316,25 +401,27 @@ static PJ *setup(PJ *P, projection_type mode) {
P->inv = adams_inverse;
if( mode == PEIRCE_Q) {
- // Quincuncial projections type options: square, diamond, hemisphere, horizontal (rectangle) or vertical (rectangle)
- const char* pqtype = pj_param (P->ctx, P->params, "stype").s;
+ // Quincuncial projections shape options: square, diamond, hemisphere, horizontal (rectangle) or vertical (rectangle)
+ const char* pqshape = pj_param (P->ctx, P->params, "sshape").s;
- if (!pqtype) pqtype = "diamond"; /* default if type value not supplied */
+ if (!pqshape) pqshape = "diamond"; /* default if shape value not supplied */
- if (strcmp(pqtype, "square") == 0) {
- Q->pqtype = PEIRCE_Q_SQUARE;
+ if (strcmp(pqshape, "square") == 0) {
+ Q->pqshape = PEIRCE_Q_SQUARE;
+ P->inv = peirce_q_square_inverse;
}
- else if (strcmp(pqtype, "diamond") == 0) {
- Q->pqtype = PEIRCE_Q_DIAMOND;
+ else if (strcmp(pqshape, "diamond") == 0) {
+ Q->pqshape = PEIRCE_Q_DIAMOND;
+ P->inv = peirce_q_diamond_inverse;
}
- else if (strcmp(pqtype, "nhemisphere") == 0) {
- Q->pqtype = PEIRCE_Q_NHEMISPHERE;
+ else if (strcmp(pqshape, "nhemisphere") == 0) {
+ Q->pqshape = PEIRCE_Q_NHEMISPHERE;
}
- else if (strcmp(pqtype, "shemisphere") == 0) {
- Q->pqtype = PEIRCE_Q_SHEMISPHERE;
+ else if (strcmp(pqshape, "shemisphere") == 0) {
+ Q->pqshape = PEIRCE_Q_SHEMISPHERE;
}
- else if (strcmp(pqtype, "horizontal") == 0) {
- Q->pqtype = PEIRCE_Q_HORIZONTAL;
+ else if (strcmp(pqshape, "horizontal") == 0) {
+ Q->pqshape = PEIRCE_Q_HORIZONTAL;
if (pj_param(P->ctx, P->params, "tscrollx").i) {
double scrollx;
scrollx = pj_param(P->ctx, P->params, "dscrollx").f;
@@ -345,8 +432,8 @@ static PJ *setup(PJ *P, projection_type mode) {
Q->scrollx = scrollx;
}
}
- else if (strcmp(pqtype, "vertical") == 0) {
- Q->pqtype = PEIRCE_Q_VERTICAL;
+ else if (strcmp(pqshape, "vertical") == 0) {
+ Q->pqshape = PEIRCE_Q_VERTICAL;
if (pj_param(P->ctx, P->params, "tscrolly").i) {
double scrolly;
scrolly = pj_param(P->ctx, P->params, "dscrolly").f;
@@ -358,7 +445,7 @@ static PJ *setup(PJ *P, projection_type mode) {
}
}
else {
- proj_log_error (P, _("peirce_q: invalid value for 'type' parameter"));
+ proj_log_error (P, _("peirce_q: invalid value for 'shape' parameter"));
return pj_default_destructor (P, PROJ_ERR_INVALID_OP_ILLEGAL_ARG_VALUE);
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-12-15 22:07:51 +0000