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DeltaKernel.cpp
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DeltaKernel.cpp
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/******************************************************************************
* Copyright (c) 2011, Michael P. Gerlek (mpg@flaxen.com)
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided
* with the distribution.
* * Neither the name of Hobu, Inc. or Flaxen Geo Consulting nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
****************************************************************************/
#include "DeltaKernel.hpp"
#include <pdal/PDALUtils.hpp>
namespace pdal
{
static StaticPluginInfo const s_info
{
"kernels.delta",
"Delta Kernel",
"http://www.pdal.io/apps/delta.html"
};
CREATE_STATIC_KERNEL(DeltaKernel, s_info)
std::string DeltaKernel::getName() const { return s_info.name; }
DeltaKernel::DeltaKernel() : m_detail(false), m_allDims(false)
{}
void DeltaKernel::addSwitches(ProgramArgs& args)
{
Arg& src = args.add("source", "source file name", m_sourceFile);
src.setPositional();
Arg& candidate = args.add("candidate", "candidate file name",
m_candidateFile);
candidate.setPositional();
args.add("detail", "Output deltas per-point", m_detail);
args.add("alldims", "Compute diffs for all dimensions (not just X,Y,Z)",
m_allDims);
}
PointViewPtr DeltaKernel::loadSet(const std::string& filename,
PointTable& table)
{
Stage& reader = makeReader(filename, m_driverOverride);
reader.prepare(table);
PointViewSet viewSet = reader.execute(table);
assert(viewSet.size() == 1);
return *viewSet.begin();
}
int DeltaKernel::execute()
{
PointTable srcTable;
PointTable candTable;
DimIndexMap dims;
PointViewPtr srcView = loadSet(m_sourceFile, srcTable);
PointViewPtr candView = loadSet(m_candidateFile, candTable);
PointLayoutPtr srcLayout = srcTable.layout();
PointLayoutPtr candLayout = candTable.layout();
Dimension::IdList ids = srcLayout->dims();
for (Dimension::Id dim : ids)
{
std::string name = srcLayout->dimName(dim);
if (!m_allDims)
if (name != "X" && name != "Y" && name != "Z")
continue;
DimIndex d;
d.m_name = name;
d.m_srcId = dim;
dims[name] = d;
}
ids = candLayout->dims();
for (Dimension::Id dim : ids)
{
std::string name = candLayout->dimName(dim);
auto di = dims.find(name);
if (di == dims.end())
continue;
DimIndex& d = di->second;
d.m_candId = dim;
}
// Remove dimensions that aren't in both the source and candidate lists.
for (auto di = dims.begin(); di != dims.end();)
{
DimIndex& d = di->second;
if (d.m_candId == Dimension::Id::Unknown)
dims.erase(di++);
else
++di;
}
// Index the candidate data.
KD3Index index(*candView);
index.build();
MetadataNode root;
if (m_detail)
root = dumpDetail(srcView, candView, index, dims);
else
root = dump(srcView, candView, index, dims);
Utils::toJSON(root, std::cout);
return 0;
}
MetadataNode DeltaKernel::dump(PointViewPtr& srcView, PointViewPtr& candView,
KD3Index& index, DimIndexMap& dims)
{
MetadataNode root;
for (PointId id = 0; id < srcView->size(); ++id)
{
PointRef point = srcView->point(id);
PointId candId = index.neighbor(point);
// It may be faster to put in a special case to avoid having to
// fetch X, Y and Z, more than once but this is simpler and
// I'm thinking in most cases it will make no practical difference.
for (auto di = dims.begin(); di != dims.end(); ++di)
{
DimIndex& d = di->second;
double sv = srcView->getFieldAs<double>(d.m_srcId, id);
double cv = candView->getFieldAs<double>(d.m_candId, candId);
accumulate(d, sv - cv);
}
}
root.add("source", m_sourceFile);
root.add("candidate", m_candidateFile);
for (auto dpair : dims)
{
DimIndex& d = dpair.second;
MetadataNode dimNode = root.add(d.m_name);
dimNode.add("min", d.m_min);
dimNode.add("max", d.m_max);
dimNode.add("mean", d.m_avg);
}
return root;
}
void DeltaKernel::accumulate(DimIndex& d, double v)
{
d.m_cnt++;
d.m_min = std::min(v, d.m_min);
d.m_max = std::max(v, d.m_max);
d.m_avg += (v - d.m_avg) / d.m_cnt;
}
MetadataNode DeltaKernel::dumpDetail(PointViewPtr& srcView,
PointViewPtr& candView, KD3Index& index, DimIndexMap& dims)
{
MetadataNode root;
for (PointId id = 0; id < srcView->size(); ++id)
{
PointRef point = srcView->point(id);
PointId candId = index.neighbor(point);
MetadataNode delta = root.add("delta");
delta.add("i", id);
for (auto di = dims.begin(); di != dims.end(); ++di)
{
DimIndex& d = di->second;
double sv = srcView->getFieldAs<double>(d.m_srcId, id);
double cv = candView->getFieldAs<double>(d.m_candId, candId);
delta.add(d.m_name, sv - cv);
}
}
return root;
}
} // pdal