cdm/src/main/java/ucar/nc2/ft2/coverage/adapter/DtCoverageCS.java
public LatLonRect getLatLonBoundingBox() {

    if (llbb == null) {

      if ((getXHorizAxis() instanceof CoordinateAxis2D) && (getYHorizAxis() instanceof CoordinateAxis2D)) {
        return null;
      }

      CoordinateAxis horizXaxis = getXHorizAxis();
      CoordinateAxis horizYaxis = getYHorizAxis();
      if (isLatLon()) {
        double startLat = horizYaxis.getMinValue();
        double startLon = horizXaxis.getMinValue();

        double deltaLat = horizYaxis.getMaxValue() - startLat;
        double deltaLon = horizXaxis.getMaxValue() - startLon;

        LatLonPoint llpt = new LatLonPointImpl(startLat, startLon);
        llbb = new LatLonRect(llpt, deltaLat, deltaLon);

      } else {
        ProjectionImpl dataProjection = getProjection();
        ProjectionRect bb = getBoundingBox();
        if (bb != null)
          llbb = dataProjection.projToLatLonBB(bb);
      }
    }

    return llbb;

      /*  // look at all 4 corners of the bounding box
        LatLonPointImpl llpt = (LatLonPointImpl) dataProjection.projToLatLon(bb.getLowerLeftPoint(), new LatLonPointImpl());
        LatLonPointImpl lrpt = (LatLonPointImpl) dataProjection.projToLatLon(bb.getLowerRightPoint(), new LatLonPointImpl());
        LatLonPointImpl urpt = (LatLonPointImpl) dataProjection.projToLatLon(bb.getUpperRightPoint(), new LatLonPointImpl());
        LatLonPointImpl ulpt = (LatLonPointImpl) dataProjection.projToLatLon(bb.getUpperLeftPoint(), new LatLonPointImpl());

        // Check if grid contains poles.
        boolean includesNorthPole = false;
        int[] resultNP;
        resultNP = findXYindexFromLatLon(90.0, 0, null);
        if (resultNP[0] != -1 && resultNP[1] != -1)
          includesNorthPole = true;
        boolean includesSouthPole = false;
        int[] resultSP;
        resultSP = findXYindexFromLatLon(-90.0, 0, null);
        if (resultSP[0] != -1 && resultSP[1] != -1)
          includesSouthPole = true;

        if (includesNorthPole && !includesSouthPole) {
          llbb = new LatLonRect(llpt, new LatLonPointImpl(90.0, 0.0)); // ??? lon=???
          llbb.extend(lrpt);
          llbb.extend(urpt);
          llbb.extend(ulpt);
          // OR
          //llbb.extend( new LatLonRect( llpt, lrpt ));
          //llbb.extend( new LatLonRect( lrpt, urpt ) );
          //llbb.extend( new LatLonRect( urpt, ulpt ) );
          //llbb.extend( new LatLonRect( ulpt, llpt ) );
        } else if (includesSouthPole && !includesNorthPole) {
          llbb = new LatLonRect(llpt, new LatLonPointImpl(-90.0, -180.0)); // ??? lon=???
          llbb.extend(lrpt);
          llbb.extend(urpt);
          llbb.extend(ulpt);
        } else {
          double latMin = Math.min(llpt.getLatitude(), lrpt.getLatitude());
          double latMax = Math.max(ulpt.getLatitude(), urpt.getLatitude());

          // longitude is a bit tricky as usual
          double lonMin = getMinOrMaxLon(llpt.getLongitude(), ulpt.getLongitude(), true);
          double lonMax = getMinOrMaxLon(lrpt.getLongitude(), urpt.getLongitude(), false);

          llpt.set(latMin, lonMin);
          urpt.set(latMax, lonMax);

          llbb = new LatLonRect(llpt, urpt);
        }
      }
    }  */

  }
public LatLonRect getLatLonBoundingBox() {

    if (llbb == null) {

      if ((getXHorizAxis() instanceof CoordinateAxis2D) && (getYHorizAxis() instanceof CoordinateAxis2D)) {
        return null;
      }

      CoordinateAxis horizXaxis = getXHorizAxis();
      CoordinateAxis horizYaxis = getYHorizAxis();
      if (isLatLon()) {
        double startLat = horizYaxis.getMinValue();
        double startLon = horizXaxis.getMinValue();

        double deltaLat = horizYaxis.getMaxValue() - startLat;
        double deltaLon = horizXaxis.getMaxValue() - startLon;

        LatLonPoint llpt = new LatLonPointImpl(startLat, startLon);
        llbb = new LatLonRect(llpt, deltaLat, deltaLon);

      } else {
        ProjectionImpl dataProjection = getProjection();
        ProjectionRect bb = getBoundingBox();
        if (bb != null)
          llbb = dataProjection.projToLatLonBB(bb);
      }
    }

    return llbb;

      /*  // look at all 4 corners of the bounding box
        LatLonPointImpl llpt = (LatLonPointImpl) dataProjection.projToLatLon(bb.getLowerLeftPoint(), new LatLonPointImpl());
        LatLonPointImpl lrpt = (LatLonPointImpl) dataProjection.projToLatLon(bb.getLowerRightPoint(), new LatLonPointImpl());
        LatLonPointImpl urpt = (LatLonPointImpl) dataProjection.projToLatLon(bb.getUpperRightPoint(), new LatLonPointImpl());
        LatLonPointImpl ulpt = (LatLonPointImpl) dataProjection.projToLatLon(bb.getUpperLeftPoint(), new LatLonPointImpl());

        // Check if grid contains poles.
        boolean includesNorthPole = false;
        int[] resultNP;
        resultNP = findXYindexFromLatLon(90.0, 0, null);
        if (resultNP[0] != -1 && resultNP[1] != -1)
          includesNorthPole = true;
        boolean includesSouthPole = false;
        int[] resultSP;
        resultSP = findXYindexFromLatLon(-90.0, 0, null);
        if (resultSP[0] != -1 && resultSP[1] != -1)
          includesSouthPole = true;

        if (includesNorthPole && !includesSouthPole) {
          llbb = new LatLonRect(llpt, new LatLonPointImpl(90.0, 0.0)); // ??? lon=???
          llbb.extend(lrpt);
          llbb.extend(urpt);
          llbb.extend(ulpt);
          // OR
          //llbb.extend( new LatLonRect( llpt, lrpt ));
          //llbb.extend( new LatLonRect( lrpt, urpt ) );
          //llbb.extend( new LatLonRect( urpt, ulpt ) );
          //llbb.extend( new LatLonRect( ulpt, llpt ) );
        } else if (includesSouthPole && !includesNorthPole) {
          llbb = new LatLonRect(llpt, new LatLonPointImpl(-90.0, -180.0)); // ??? lon=???
          llbb.extend(lrpt);
          llbb.extend(urpt);
          llbb.extend(ulpt);
        } else {
          double latMin = Math.min(llpt.getLatitude(), lrpt.getLatitude());
          double latMax = Math.max(ulpt.getLatitude(), urpt.getLatitude());

          // longitude is a bit tricky as usual
          double lonMin = getMinOrMaxLon(llpt.getLongitude(), ulpt.getLongitude(), true);
          double lonMax = getMinOrMaxLon(lrpt.getLongitude(), urpt.getLongitude(), false);

          llpt.set(latMin, lonMin);
          urpt.set(latMax, lonMax);

          llbb = new LatLonRect(llpt, urpt);
        }
      }
    }  */

  }
Get horizontal bounding box in lat, lon coordinates.

@return lat, lon bounding box.