Changeset 32347 for trunk/psModules/src/objects/models/pmModel_PGAUSS.c

Timestamp:

Sep 6, 2011, 1:02:53 PM (15 years ago)

Author:

eugene

Message:

• add concept of saddlePoints to peaks (not actually used in the end)
• add tmp flags to mark sources for analysis or not in psphotStack
• autocode the pmSourceIO_CMF_PS1_* functions
• use 1D gauss approx for convolution in PCM fitting
• added pmSourceExtFitPars (not actually used)
• in model guess, use 1st radial moments to define size (if it exists)
• include PSF_INST_MAG, AP_MAG, KRON_MAG in xfit output
• fix the position for extended source fits (avoid instability)
• Sersic-like models (incl. Exp and Dev) use Reff, not sigma; conversion tools need to respect this
• only use a single pass on the centroid (unwindowed, but limited to 1.5 sigma radius) - this avoids moving the centroid because of nearby neighbors
• use symmetrical averaging (geometric mean) to calculated 1st radial moment (and avoid neighbor biases), do not use symm. averaging for the flux
• fix the integration of the sersic, pgauss, and related model functions.
• fix the central pixel to have the full flux for sersic-like models (interpolated value)

Location:

trunk/psModules/src/objects

Files:

• . (modified) (1 prop)
• models/pmModel_PGAUSS.c (modified) (2 diffs)

trunk/psModules/src/objects

@@ -5 +5 @@
 *.la
 *.lo
+pmSourceIO_CMF_PS1_V1.c
+pmSourceIO_CMF_PS1_V2.c
+pmSourceIO_CMF_PS1_V3.c

@@ -5 +5 @@
 *.la
 *.lo
+pmSourceIO_CMF_PS1_V1.c
+pmSourceIO_CMF_PS1_V2.c
+pmSourceIO_CMF_PS1_V3.c

trunk/psModules/src/objects/models/pmModel_PGAUSS.c

@@ -217 +217 @@
 }
 
-psF64 PM_MODEL_FLUX(const psVector *params)
-{
-    float norm, z;
+// integrate the model to get the full flux
+psF64 PM_MODEL_FLUX (const psVector *params)
+{
+    float z, norm;
     psEllipseShape shape;
 
@@ -228 +229 @@
     shape.sxy = PAR[PM_PAR_SXY];
 
-    // Area is equivalent to 2 pi sigma^2
     psEllipseAxes axes = psEllipseShapeToAxes (shape, 20.0);
-    psF64 Area = 2.0 * M_PI * axes.major * axes.minor;
-
-    // the area needs to be multiplied by the integral of f(z)
+    float AspectRatio = axes.minor / axes.major;
+
+    // flux = 2 \pi \int f(r) r dr
     norm = 0.0;
 
-    # define DZ 0.25
-
-    float f0 = 1.0;
+    # define DR 0.25
+
+    // f = f(r) * r
+    float f0 = 0.0;
     float f1, f2;
-    for (z = DZ; z < 150; z += DZ) {
-        f1 = 1.0 / (1 + z + z*z/2.0 + z*z*z/6.0);
-        z += DZ;
-        f2 = 1.0 / (1 + z + z*z/2.0 + z*z*z/6.0);
+    for (float r = DR; r < 150; r += DR) {
+        z = 0.5 * PS_SQR(r / axes.major);
+        f1 = r / (1 + z + z*z/2.0 + z*z*z/6.0);
+        r += DR;
+        z = 0.5 * PS_SQR(r / axes.major);
+        f2 = r / (1 + z + z*z/2.0 + z*z*z/6.0);
         norm += f0 + 4*f1 + f2;
         f0 = f2;
     }
-    norm *= DZ / 3.0;
-
-    psF64 Flux = PAR[PM_PAR_I0] * Area * norm;
+    norm *= DR / 3.0;
+
+    psF64 Flux = PAR[PM_PAR_I0] * norm * 2.0 * M_PI * AspectRatio;
 
     return(Flux);

@@ -5 +5 @@
 *.la
 *.lo
+pmSourceIO_CMF_PS1_V1.c
+pmSourceIO_CMF_PS1_V2.c
+pmSourceIO_CMF_PS1_V3.c