| In this project we will demonstrate the combined use of remote sensing products, in-situ measurements and simulation model results and prepare the implementation of spatial data in the monitoring infrastructure at the Dutch Ministry of Transport Public Works and Water Management - Directorate IJsselmeer Region (Directie IJsselmeergebied RDIJ). Background In a previous application project (MERIJS) a large investment has been made to provide all the necessary in situ measurements and algorithms for interpretation of the SeaWiFS and MERIS images of Lake IJssel: Data sets comprising the Specific Inherent Optical Properties of in-vivo algal blooms at the IJsselmeer were collected, together with data on algal divisions from a flowcytometer and R(0-) field spectra from a PR-650. A detailed water quality (DBS) model was adapted and prepared for intercomparison with RS and in-situ measurements. From the combination of SeaWiFS images, DBS model output, maps of monthly mean CHL were made and compared with the measurements at Vrouwezand. The Institute for Inland Water Management and Waste Water Treatment (RIZA), which is the end user of the MERIJS project has critically assessed these products. Based on the applications of Remote Sensing products, RIZA has made strong recommendations to demonstrate the SeaWiFS and MERIS mapping capabilities of Lake IJssel to support the monitoring activities of RDIJ for future implementation. The SPAC project focuses on two main activities: 1 The demonstration of the monitoring capacities of ocean colour instruments. An Atlas will be made that uses the water-quality products from SeaWiFS over the year 2003. This Atlas, will contain higher-level products analogous to the RIKZ North Sea Atlas. For the summer, it will provide information on fortnightly mean and summer average maps for Chlorophyll-a (Chl-a). For the winter period, it will contain monthly or two-monthly mean maps. This data will be compared to in-situ data and model-simulation results. 2 The demonstration of the MERIS capacities on monitoring CHL-a. The band setting and Signal to Noise of the MERIS instrument is superior to SeaWiFS with respect to Chl-a detection. MERIS data for the year 2003 and in-situ data will be collected and analysed. The outcome can be compared to the results of the SeaWiFS processing. If the products can be demonstrated to be of sufficient quality, MERIS data form the basis for future editions of an IJsselmeer atlas . Attention will be paid to validation and quality control, as well a to costs for implementation as a standard service. Anticipated Results: An atlas of water quality parameters in Lake IJsselmeer 2003 is being produced. This atlas contains information about the validation and the estimated errors of the products; The processed satellite data and model-simulation results will be made available to the Meetdienst IJsselmeer. Model-simulation results will be available on the www in Audio Video Interleave (AVI) format; The SeaWiFS and MERIS data are compared to the in-situ measurements and a set of PR650 spectra for proper validation; This set of measurements and models for the year 2003 is an ideal set to start the investigation of the relation between climate (input by the IJssel river, meteorological conditions) and water quality. End products: An Atlas of water quality in lake IJsselmeer is printed and/or available as PDF on the WWW; A note on the assessment of the actual cost for routine delivery of satellite products containing a matrix of time difference between delivery of products and time of overpass against cost. |
