/* Initialize the Lambert Azimuthal Equal Area projection
------------------------------------------------------*/
long lamazforint
(
double r, /* (I) Radius of the earth (sphere) */
double center_long, /* (I) Center longitude */
double center_lat, /* (I) Center latitude */
double false_east, /* x offset in meters */
double false_north /* y offset in meters */
)
{
/* Place parameters in static storage for common use
-------------------------------------------------*/
R = r;
lon_center = center_long;
false_easting = false_east;
false_northing = false_north;
gctp_sincos(center_lat, &sin_lat_o, &cos_lat_o);
/* Report parameters to the user
-----------------------------*/
ptitle("LAMBERT AZIMUTHAL EQUAL-AREA");
radius(r);
cenlon(center_long);
cenlat(center_lat);
offsetp(false_easting,false_northing);
return(GCTP_OK);
}
/* Initialize the General Vertical Near-Side Perspective projection
---------------------------------------------------------------*/
long gvnspforint
(
double r, /* (I) Radius of the earth (sphere) */
double h, /* height above sphere */
double center_long, /* (I) Center longitude */
double center_lat, /* (I) Center latitude */
double false_east, /* x offset in meters */
double false_north /* y offset in meters */
)
{
/* Place parameters in static storage for common use
-------------------------------------------------*/
R = r;
p = 1.0 + h / R;
lon_center = center_long;
false_easting = false_east;
false_northing = false_north;
gctp_sincos(center_lat, &sin_p15, &cos_p15);
/* Report parameters to the user
-----------------------------*/
ptitle("GENERAL VERTICAL NEAR-SIDE PERSPECTIVE");
radius(r);
genrpt(h,"Height of Point Above Surface of Sphere: ");
cenlon(center_long);
cenlat(center_lat);
offsetp(false_easting,false_northing);
return(GCTP_OK);
}
/* Initialize the Sinusoidal projection
------------------------------------*/
int sininvint(
double r_maj, /* major axis */
double r_min, /* minor axis */
double center_long, /* (I) Center longitude */
double false_east, /* x offset in meters */
double false_north) /* y offset in meters */
{
/* Place parameters in static storage for common use
-------------------------------------------------*/
R = r_maj;
if(fabs(r_min) < EPSLN ) /* sphere */
{
r_major = r_maj;
r_minor = r_maj;
}
else /* sphere or ellipsoide */
{
r_major = r_maj;
r_minor = r_min;
}
lon_center = center_long;
false_easting = false_east;
false_northing = false_north;
es = 1.0 - SQUARE(r_minor / r_major);
e = sqrt(es);
if(e < 0.00001)
{
ind = 1; /* sphere */
}
else
{
double e12, e13, e14;
ind = 0; /* ellipsoid */
e1 = (1.0 - sqrt(1.0 - es))/(1.0 + sqrt(1.0 - es));
e12 = e1 * e1;
e13 = e12 * e1;
e14 = e13 * e1;
imu = (1.0 - (es/4.0) - (3.0 * es * es / 64.0) -
(5.0 * es * es * es /256.0));
e2 = ((3.0 * e1 /2.0) - (27.0 * e13 / 32.0));
e3 = ((21.0 * e12 / 16.0) - (55.0 * e14 / 32.0));
e4 = (151.0 * e13 / 96.0);
e5 = (1097.0 * e14 / 512.0);
}
/* Report parameters to the user
-----------------------------*/
ptitle("SINUSOIDAL");
radius2(r_major, r_minor);
cenlon(center_long);
offsetp(false_easting,false_northing);
return(OK);
}
/* Initialize the ALASKA CONFORMAL projection
-----------------------------------------*/
long alconinvint
(
double r_maj, /* Major axis */
double r_min, /* Minor axis */
double false_east, /* x offset in meters */
double false_north /* y offset in meters */
)
{
double es;
double chi;
double esphi;
/* Place parameters in static storage for common use
-------------------------------------------------*/
r_major = r_maj;
r_minor = r_min;
false_easting = false_east;
false_northing = false_north;
lon_center = -152.0 * D2R;
lat_center = 64.0 * D2R;
n = 6;
es = .006768657997291094;
e = sqrt(es);
acoef[1]= 0.9945303;
acoef[2]= 0.0052083;
acoef[3]= 0.0072721;
acoef[4]= -0.0151089;
acoef[5]= 0.0642675;
acoef[6]= 0.3582802;
bcoef[1]= 0.0;
bcoef[2]= -.0027404;
bcoef[3]= 0.0048181;
bcoef[4]= -0.1932526;
bcoef[5]= -0.1381226;
bcoef[6]= -0.2884586;
esphi = e * sin(lat_center);
chi = 2.0 * atan(tan((HALF_PI + lat_center)/2.0) *
pow(((1.0 - esphi)/(1.0 + esphi)),(e/2.0))) - HALF_PI;
gctp_sincos(chi,&sin_p26,&cos_p26);
/* Report parameters to the user
-----------------------------*/
ptitle("ALASKA CONFORMAL");
radius2(r_major,r_minor);
cenlon(lon_center);
cenlat(lat_center);
offsetp(false_easting,false_northing);
return(GCTP_OK);
}
/* Initialize the Polar Stereographic projection
--------------------------------------------*/
long psinvint
(
double r_maj, /* major axis */
double r_min, /* minor axis */
double c_lon, /* center longitude */
double c_lat, /* center latitude */
double false_east, /* x offset in meters */
double false_north /* y offset in meters */
)
{
double temp; /* temporary variable */
double con1; /* temporary angle */
double sinphi; /* sin value */
double cosphi; /* cos value */
double es; /* eccentricity squared */
r_major = r_maj;
r_minor = r_min;
false_easting = false_east;
false_northing = false_north;
temp = r_minor / r_major;
es = 1.0 - SQUARE(temp);
e = sqrt(es);
e4 = e4fn(e);
center_lon = c_lon;
center_lat = c_lat;
if (c_lat < 0)
fac = -1.0;
else
fac = 1.0;
ind = 0;
if (fabs(fabs(c_lat) - HALF_PI) > EPSLN)
{
ind = 1;
con1 = fac * center_lat;
gctp_sincos(con1,&sinphi,&cosphi);
mcs = msfnz(e,sinphi,cosphi);
tcs = tsfnz(e,con1,sinphi);
}
/* Report parameters to the user
-----------------------------*/
ptitle("POLAR STEREOGRAPHIC");
radius2(r_major, r_minor);
cenlon(center_lon);
offsetp(false_east,false_north);
return(GCTP_OK);
}
// Initialize the Polar Stereographic projection
long Projectoid::psinvint(
double r_maj, // major axis
double r_min, // minor axis
double c_lon, // center longitude
double c_lat, // center latitude
double false_east, // x offset in meters
double false_north) // y offset in meters
{
double temp; // temporary variable
double con1; // temporary angle
double sinphi; // sin value
double cosphi; // cos value
double es; // eccentricity squared
r_major = r_maj;
r_minor = r_min;
false_easting = false_east;
false_northing = false_north;
temp = r_minor / r_major;
es = 1.0 - SQUARE(temp);
e = sqrt(es);
e4 = e4fn(e);
center_lon = c_lon;
center_lat = c_lat;
if (c_lat < 0)
fac = -1.0;
else
fac = 1.0;
ind = 0;
if (fabs(fabs(c_lat) - HALF_PI) > EPSLN)
{
ind = 1;
con1 = fac * center_lat;
sincos(con1, &sinphi, &cosphi);
mcs = msfnz(e, sinphi, cosphi);
tcs = tsfnz(e, con1, sinphi);
}
// Report parameters to the user
ptitle("POLAR STEREOGRAPHIC");
radius2(r_major, r_minor);
cenlon(center_lon);
offsetp(false_east, false_north);
InverseOK[WCS_PROJECTIONCODE_PS] = 1;
InverseTransform = &Projectoid::psinv;
return(OK);
}
/* Initialize the Miller Cylindrical projection
-------------------------------------------*/
int millforint(
double r, /* (I) Radius of the earth (sphere) */
double center_long, /* (I) Center longitude */
double false_east, /* x offset in meters */
double false_north) /* y offset in meters */
{
/* Place parameters in static storage for common use
-------------------------------------------------*/
R = r;
lon_center = center_long;
false_easting = false_east;
false_northing = false_north;
/* Report parameters to the user
-----------------------------*/
ptitle("MILLER CYLINDRICAL");
radius(r);
cenlon(center_long);
offsetp(false_easting,false_northing);
return(OK);
}
long obleqforint
(
double r,
double center_long,
double center_lat,
double shape_m,
double shape_n,
double angle,
double false_east,
double false_north
)
{
/* Place parameters in static storage for common use
-------------------------------------------------*/
R = r;
lon_center = center_long;
lat_o = center_lat;
m = shape_m;
n = shape_n;
theta = angle;
false_easting = false_east;
false_northing = false_north;
/* Report parameters to the user (to device set up prior to this call)
-------------------------------------------------------------------*/
ptitle("OBLATED EQUAL-AREA");
radius(R);
cenlon(lon_center);
cenlat(lat_o);
genrpt(m,"Parameter m: ");
genrpt(n,"Parameter n: ");
genrpt(theta,"Theta: ");
offsetp(false_easting,false_northing);
/* Calculate the sine and cosine of the latitude of the center of the map
and store in static storage for common use.
-------------------------------------------*/
gctp_sincos(lat_o, &sin_lat_o, &cos_lat_o);
return(GCTP_OK);
}
/* Initialize the Van Der Grinten projection
----------------------------------------*/
long vandgforint
(
double r, /* (I) Radius of the earth (sphere) */
double center_long, /* (I) Center longitude */
double false_east, /* x offset in meters */
double false_north /* y offset in meters */
)
{
/* Place parameters in static storage for common use
-------------------------------------------------*/
R = r;
lon_center = center_long;
false_easting = false_east;
false_northing = false_north;
/* Report parameters to the user
-----------------------------*/
ptitle("VAN DER GRINTEN");
radius(r);
cenlon(center_long);
offsetp(false_easting,false_northing);
return(GCTP_OK);
}
// Initialize the Wagner VII projection
long Projectoid::wviiinvint(
double r, // (I) Radius of the earth (sphere)
double center_long, // (I) Center longitude
double false_east, // x offset
double false_north) // y offset
{
// Place parameters in static storage for common use
R = r;
lon_center = center_long;
false_easting = false_east;
false_northing = false_north;
// Report parameters to the user
ptitle("WAGNER VII");
radius(r);
cenlon(center_long);
offsetp(false_easting, false_northing);
InverseOK[WCS_PROJECTIONCODE_WAGVII] = 1;
InverseTransform = &Projectoid::wviiinv;
return(OK);
}
// Initialize the ROBINSON projection
long Projectoid::robinvint(
double r, // (I) Radius of the earth (sphere)
double center_long, // (I) Center longitude
double false_east, // x offset in meters
double false_north) // y offset in meters
{
long i;
// Place parameters in static storage for common use
R = r;
lon_center = center_long;
false_easting = false_east;
false_northing = false_north;
pr[1]= -0.062;
xlr[1]=0.9986;
pr[2]=0.0;
xlr[2]=1.0;
pr[3]=0.062;
xlr[3]=0.9986;
pr[4]=0.124;
xlr[4]=0.9954;
pr[5]=0.186;
xlr[5]=0.99;
pr[6]=0.248;
xlr[6]=0.9822;
pr[7]=0.31;
xlr[7]=0.973;
pr[8]=0.372;
xlr[8]=0.96;
pr[9]=0.434;
xlr[9]=0.9427;
pr[10]=0.4958;
xlr[10]=0.9216;
pr[11]=0.5571;
xlr[11]=0.8962;
pr[12]=0.6176;
xlr[12]=0.8679;
pr[13]=0.6769;
xlr[13]=0.835;
pr[14]=0.7346;
xlr[14]=0.7986;
pr[15]=0.7903;
xlr[15]=0.7597;
pr[16]=0.8435;
xlr[16]=0.7186;
pr[17]=0.8936;
xlr[17]=0.6732;
pr[18]=0.9394;
xlr[18]=0.6213;
pr[19]=0.9761;
xlr[19]=0.5722;
pr[20]=1.0;
xlr[20]=0.5322;
for (i = 0; i < 21; i++)
xlr[i] *= 0.9858;
// Report parameters to the user
ptitle("ROBINSON");
radius(r);
cenlon(center_long);
offsetp(false_easting, false_northing);
InverseOK[WCS_PROJECTIONCODE_ROBIN] = 1;
InverseTransform = &Projectoid::robinv;
return(OK);
}
/* Initialize the General Lambert Azimuthal Equal Area projection
--------------------------------------------------------------*/
int lamazforint(
double r_maj, /* major axis */
double r_min, /* minor axis */
double center_long, /* (I) Center longitude */
double center_lat, /* (I) Center latitude */
double false_east, /* x offset in meters */
double false_north) /* y offset in meters */
{
/* Place parameters in static storage for common use
-------------------------------------------------*/
R = r_maj;
if(fabs(r_min) < EPSLN ) /* sphere */
{
r_major = r_maj;
r_minor = r_maj;
}
else /* sphere or ellipsoide */
{
r_major = r_maj;
r_minor = r_min;
}
lon_center = center_long;
lat_center = center_lat;
false_easting = false_east;
false_northing = false_north;
tsincos(center_lat, &sin_lat_o, &cos_lat_o);
sinphi1 = sin_lat_o;
cosphi1 = cos_lat_o;
es = 1.0 - SQUARE(r_minor / r_major);
e = sqrt(es);
if(es < 0.00001)
{
ind = 1; /* sphere */
qp = 2.0;
q1 = 2.0;
}
else
{
ind = 0; /* ellipsoid */
qp = (1.0 - es)* (((1.0/(1.0 - es))-(1.0/(2.0*e))*log((1.0 - e)/(1.0 + e))));
if((fabs (lat_center - HALF_PI) <= EPSLN ) || (fabs (lat_center + HALF_PI) <= EPSLN ))
{
/* no other constants needed for LA with North and South polar Aspects lat_center = 90 or -90*/
}
else
{
tsincos(lat_center, &sinphi1, &cosphi1);
q1 = (1.0 - es) * ((sinphi1 / (1.0 - es * sinphi1 * sinphi1))
- (1.0 / (2.0 * e)) *
log((1.0 - e * sinphi1)/(1.0 + e * sinphi1)));
Rq = r_major * sqrt(qp/2.0);
if(fabs(q1) >= fabs(qp))
{
beta1 = HALF_PI * (fabs(q1/qp)/(q1/qp));
}
else
{
beta1 = asinz(q1/qp);
}
tsincos(beta1, &sin_beta1, &cos_beta1);
m1 = cosphi1 / sqrt(1.0 - es * sinphi1 * sinphi1);
D = (r_major * m1)/ (Rq * cos_beta1);
}
}
/* Report parameters to the user
-----------------------------*/
ptitle("LAMBERT AZIMUTHAL EQUAL-AREA");
radius2(r_major, r_minor);
cenlon(center_long);
cenlat(center_lat);
offsetp(false_easting,false_northing);
return(OK);
}
/*
!C******************************************************************************
!Description: Isin_for_init (initialize mapping) initializes the integerized
sinusoidal transformations by calculating constants and a short-cut
lookup table.
!Input Parameters:
sphere sphere radius (user's units)
lon_cen_mer longitude of central meridian (radians)
false_east easting at projection origin (user's units)
false_north northing at projection origin (user's units)
nrow number of rows (longitudinal zones)
ijustify justify flag; flag to indicate what to do with rows with an
odd number of columns;
0 = indicates the extra column is on the right
of the projection y axis;
1 = indicates the extra column is on the left
of the projection y axis;
2 = calculate an even number of columns
!Output Parameters:
(returns) a handle for this instance of the integerized sinusoidal
projection or NULL for error
!Team Unique Header:
! Usage Notes:
1. The sphere radius must not be smaller than 'EPS_SPHERE'.
2. The longitude must be in the range [-'TWO_PI' to 'TWO_PI'].
3. The number of rows must be a multiple of two and no more than 'NROW_MAX'.
!END****************************************************************************
*/
Isin_t *Isin_for_init
(
double sphere,
double lon_cen_mer,
double false_east,
double false_north,
long nrow,
int ijustify
)
{
Isin_t *this; /* 'isin' data structure */
Isin_row_t *row; /* current row data structure */
long irow; /* row (zone) index */
double clat; /* central latitude of the row */
long ncol_cen; /* number of columns in the central row of the grid
(at the equator) */
#ifdef CHECK_EDGE
double dcol; /* delta column (normalized by number of columns) */
double dcol_min, /* minimum delta column */
double log2_dcol_min; /* log base 2 of minimum delta column */
dcol_min = 1.0;
#endif
/* Check input parameters */
if ( sphere < EPS_SPHERE )
{
Isin_error( &ISIN_BADPARAM, "Isin_for_init" );
return NULL;
}
if ( lon_cen_mer < -TWO_PI || lon_cen_mer > TWO_PI )
{
Isin_error( &ISIN_BADPARAM, "Isin_for_init" );
return NULL;
}
if ( lon_cen_mer < PI )
lon_cen_mer += TWO_PI;
if ( lon_cen_mer >= PI )
lon_cen_mer -= TWO_PI;
if ( nrow < 2 || nrow > NROW_MAX )
{
Isin_error( &ISIN_BADPARAM, "Isin_for_init" );
return NULL;
}
if ( ( nrow % 2 ) != 0 )
{
Isin_error( &ISIN_BADPARAM, "Isin_for_init" );
return NULL;
}
if ( ijustify < 0 || ijustify > 2 )
{
Isin_error( &ISIN_BADPARAM, "Isin_for_init" );
return NULL;
}
/* Allocate 'isin' data structure */
this = ( Isin_t * ) malloc( sizeof( Isin_t ) );
if ( this == NULL )
{
Isin_error( &ISIN_BADALLOC, "Isin_for_init" );
return NULL;
}
/* Place parameters in static storage for common use
-------------------------------------------------
R = sphere;
lon_center = lon_cen_mer;
false_easting = false_east;
false_northing = false_north;
zone = nrow;
justify = ijustify;
*/
/* Report parameters to the user
-----------------------------*/
ptitle("INTEGERIZED SINUSOIDAL");
radius(sphere);
cenlon(lon_cen_mer);
offsetp(false_east,false_north);
genrpt_long(nrow, "Number of Latitudinal Zones: ");
genrpt(ijustify, "Right Justify Columns Flag: ");
/* Initialize data structure */
this->key = 0;
this->false_east = false_east;
this->false_north = false_north;
this->sphere = sphere;
this->sphere_inv = 1.0 / sphere;
this->ang_size_inv = ( ( double ) nrow ) / PI;
this->nrow = nrow;
this->nrow_half = nrow / 2;
this->lon_cen_mer = lon_cen_mer;
this->ref_lon = lon_cen_mer - PI;
if ( this->ref_lon < -PI )
this->ref_lon += TWO_PI;
this->ijustify = ijustify;
/* Allocate space for information about each row */
this->row = (Isin_row_t *)malloc(this->nrow_half * sizeof(Isin_row_t));
if ( this->row == NULL )
{
free( this );
Isin_error( &ISIN_BADALLOC, "Isin_for_init" );
return NULL;
}
/* Do calculations for each row; calculations are only done for half
* the rows because of the symmetry between the rows above the
* equator and the ones below */
row = this->row;
for ( irow = 0; irow < this->nrow_half; irow++, row++ )
{
/* Calculate latitude at center of row */
clat = HALF_PI * ( 1.0 - ( ( double ) irow + 0.5 ) / this->nrow_half );
/* Calculate number of columns per row */
if ( ijustify < 2 )
row->ncol = (long)((2.0 * cos(clat) * nrow) + 0.5);
else
{
/* make the number of columns even */
row->ncol = (long)((cos(clat) * nrow) + 0.5);
row->ncol *= 2;
}
#ifdef CHECK_EDGE
/* Check to be sure the are no less then three columns per row and that
* there are exactly three columns at the poles */
if ( ijustify < 2 )
{
if ( row->ncol < 3 || ( irow == 0 && row->ncol != 3 ) )
printf( " irow = %d ncol = %d\n", irow, row->ncol );
}
else
{
if ( row->ncol < 6 || ( irow == 0 && row->ncol != 6 ) )
printf( " irow = %d ncol = %d\n", irow, row->ncol );
}
#endif
/* Must have at least one column */
if ( row->ncol < 1 )
row->ncol = 1;
#ifdef CHECK_EDGE
/* Calculate the minimum delta column (normalized by the number of
* columns in the row) */
if ( ijustify < 2 )
dcol = fabs( ( 2.0 * cos( clat ) * nrow ) + 0.5 - row->ncol );
else
dcol = 2.0 * fabs((cos(clat) * nrow) + 0.5 - (row->ncol/2));
dcol = dcol / row->ncol;
if ( dcol < dcol_min )
dcol_min = dcol;
if ( ijustify < 2 )
{
dcol = fabs((2.0 * cos(clat) * nrow) + 0.5 - (row->ncol + 1));
dcol = dcol / ( row->ncol + 1 );
}
else
{
dcol = 2.0 * fabs((cos(clat) * nrow) + 0.5 - ((row->ncol/2) + 1));
dcol = dcol / ( row->ncol + 2 );
}
if ( dcol < dcol_min )
dcol_min = dcol;
#endif
/* Save the inverse of the number of columns */
row->ncol_inv = 1.0 / ( ( double ) row->ncol );
/* Calculate the column number of the column whose left edge touches
the central meridian */
if ( ijustify == 1 )
row->icol_cen = ( row->ncol + 1 ) / 2;
else
row->icol_cen = row->ncol / 2;
} /* for (irow... */
/* Get the number of columns at the equator */
ncol_cen = this->row[this->nrow_half - 1].ncol;
#ifdef CHECK_EDGE
/* Print the minimum delta column and its base 2 log */
log2_dcol_min = log( dcol_min ) / log( 2.0 );
printf( " dcol_min = %g log2_dcol_min = %g\n", dcol_min, log2_dcol_min );
/* Check to be sure the number of columns at the equator is twice the
* number of rows */
if ( ncol_cen != nrow * 2 )
printf( " ncol_cen = %d nrow = %d\n", ncol_cen, nrow );
#endif
/* Calculate the distance at the equator between
* the centers of two columns (and the inverse) */
this->col_dist = ( TWO_PI * sphere ) / ncol_cen;
this->col_dist_inv = ncol_cen / ( TWO_PI * sphere );
/* Give the data structure a valid key */
this->key = ISIN_KEY;
/* All done */
return this;
}
