units.xsd v3.0 draft last updated 2002/04/22 GML 3.0 candidate schema. Copyright (c) 2002 OGC, All Rights Reserved. This schema encodes the Data Quality (DQ) package in the CRS UML model. Position error estimate (or accuracy) data. A description of the position accuracy parameter(s) provided. To be supplied. To be supplied. To be supplied. To be supplied. Error estimate covariance matrix. Ordered sequence of units of measure, corresponding to the row and column index numbers of the covariance matrix, starting with row and column 1 and ending with row/column N. Each unit of measure is for the ordinate reflected in the relevant row and column of the covariance matrix. Unordered sequence of elements of this covariance matrix. Because the covariance matrix is symmetrical, only the elements in upper or lower diagonal part (including the main diagonal) of the matrix need to be specified. Any zero valued covariance elements can be omitted. An element of a covariance matrix. Row number of this covariance element value. Column number of this covariance element value. Value of covariance element.