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    Archived pages: 580 . Archive date: 2014-01.

  • Title: FAQ temp | OPeNDAP
    Descriptive info: ›.. Frequently Asked Questions.. FAQ temp.. Wed, 05/11/2011 - 08:56 —.. nehal bathani.. answer will be here.. to post comments..

    Original link path: /node/133
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  • Title: netCDF file response handler | OPeNDAP
    Descriptive info: › netCDF file response handler.. netCDF file response handler.. This is the netCDF file response module for the for.. Hyrax.. This handler is used to format returned data as a netCDF file.. With a Hyrax server that has this handler installed and configured, a user may append a '.. nc' to a URL (in the say way that they have always been able to append a '.. asc') and get the data back in a netCDF File.. Note: This page lists our 'full releases' of the handler.. Sometimes we make source-only releases or internal releases and don't bother to include them here.. That is why the version numbers you see here have 'gaps.. '.. Our software distributions are signed using a public/private key pair.. See.. Public Key.. for more information.. NetCDF File Response Handler 1.. 1.. 0 / Hyrax 1.. 6.. 2 (15 September 2010).. Note:.. This version is part of the Hyrax 1.. 2 release.. This version of the module has several new features:.. Sequences are now supported.. HDF4 files (and others) where arrays with the same base names appear in several places are now supported.. The module handles DAP's lexical scoping correctly.. Binaries.. Linux (x86_64).. CentOS 5.. 2, RPMs.. (gcc 4.. 1).. Linux (i386).. Source code.. Version 1.. 0.. tar.. gz.. ,.. gpg signature.. Required:.. libdap 3.. 11.. bes 3.. Contributed builds.. Contributed.. :  ...   better automated tests and support for the new BES configuration file scheme.. Known issues with this release of the module: Shared dimensions that are a part of variables with different dimensionality do not create the shared dimensions in the generated netcdf file and sometimes causes the processing to throw an exception.. This issue is being worked on and we should have a fix for it shortly.. More information on the module can be found at.. http://docs.. opendap.. org/index.. php/BES_-_Modules_-_FileOut_Netcdf.. NetCDF file response handler 0.. 3 (15 June 2009).. This release fixes a problem with HDF4 files and repeating dimensions.. In the previous version the first dimension size and name was used for all of the dimensions of any array in an HDF4 file.. Not arrays in HDF4 files are dimensioned correctly.. Apple OS/X (10.. 4).. Intel DMG (gpg signature), PPC DMG (gpg signature).. Version 0.. 7.. 2 (13 April 2009).. This is the first release of the handler and it's not quite 'feature-complete' but it is still very usable.. This version will produce a netCDF for many different types of data sets served by Hyrax.. However, it does not yet understand Sequence types.. Fixes since the 0.. 0 beta release:.. Variable names are compatible with netCDF 3.. Sequences are currently elided but an attribute is added to the file noting each variable that has been removed..

    Original link path: /fileout_netCDF_Handler
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  • Title: OPeNDAP Data Connector Web Guide | OPeNDAP
    Descriptive info: › OPeNDAP Data Connector Web Guide.. OPeNDAP Data Connector Web Guide.. Thu, 04/28/2011 - 16:30 —.. OPeNDAP Data Connector.. Web Guide.. Version 2.. 50.. 1 June 2004.. funded by the National Oceanographic Partnership Program.. The OPeNDAP Data Connector (ODC) can search for, retrieve and plot datasets published by OPeNDAP data servers.. It can help you preview data and  ...   virtually any computing platform including the PC, Macintosh and most Unix- or Linux-based computers.. This web guide to ODC illustrates all of its major features and shows you how they work:.. Navigation - Getting Around in the ODC.. Searching - Searching for Data.. Retrieving - Retrieving and Subsetting Data.. Viewing - Features for Previewing Data.. Revised 28 May 2004..

    Original link path: /ODC_Webguide
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  • Title: OPeNDAP Overview | OPeNDAP
    Descriptive info: QuickStart.. Support.. Documentation.. User Documentation.. Design Documentation.. Movies.. Project Documentation.. Available Clients.. Available Servers.. Workshops Presentations.. Sources of Data.. Mail Lists.. OPeNDAP Wiki.. › OPeNDAP Overview.. OPeNDAP Overview.. An overview of the OPeNDAP system in operation.. Detailed inforamtion for.. Matlab.. , the.. Matlab Graphical Interface.. Ferret.. and.. LAS.. is also available..

    Original link path: /OPeNDAP_Overview
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  • Title: Pseudocolor : Bathymetry | OPeNDAP
    Descriptive info: › Pseudocolor : Bathymetry.. Pseudocolor : Bathymetry.. Tue, 05/03/2011 - 10:23 —.. Bathymetry and relief plot from the Carolinas Coastal Ocean Observing and Prediction System.. The Carolinas Coastal Ocean Observing and Prediction System sponsors research concerning ocean storms and climate affecting the Carolinas shore in North America.. This plot illustrates a display of both land relief and bathymetry using their bathymetry data set.. The plot is good way to learn some of the features of the ODC's color control system.. return to ODC gallery.. Step-By-Step.. Search / Dataset List.. retrieve Carolinas Coastal Ocean Observing and Prediction System /.. Storm Surge.. directory.. open "bathy" directory.. double-click bathys.. nc file to get DDS.. select Grid and bathymetry variables from DDS.. output to plotter.. discussion:.. In this intermediate plot we can see.. a couple.. of things.. First of all the missing values found automatically by the ODC (1.. 0 4.. 0 5.. 0 15.. 0) are incorrect.. This is because developed areas near the coast are paved over and have identical elevations.. This leads to spikes in the datasets that the ODC identifies as possible  ...   We can generate just such colors by using the multi-hue color generator.. If you are unfamiliar with the color generator you may want to read the help topic on this feature to get an idea of what it can do.. in the plotter go to the colors tab.. Plot Specification : change "Plots generate their own colors" to "Plot uses: Default".. Color Generator : create a 2-color multi-hue [two new ranges will appear].. select the default range (that goes from -4197.. 4 to 275) and delete it.. Now we want to make the break between the hues at the 0 elevation (the coast).. select range 1 (-4197 : -1961.. 2).. change range 1's DataTo range from -1961.. 2 to 0.. select range 2 (-1961.. 2 : 275.. 0).. change range 2's DataTo range from -1961.. modify the colors of range 1 to go from cyan to magenta continuously.. intensify the red highlights by increasing the brightness on the dark end of range 2.. modify text annotations.. plot it.. go to OPeNDAP home.. OPeNDAP Data Connector Plot Gallery Revised 25 January 2004 ·..

    Original link path: /Pseudocolor_Bathymetry
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  • Title: OPeNDAP Data Connector Plot Gallery | OPeNDAP
    Descriptive info: › OPeNDAP Data Connector Plot Gallery.. OPeNDAP Data Connector Plot Gallery.. Tue, 05/03/2011 - 09:33 —.. Example plots with step-by-step instructions.. Here is a sampling of plots all created from within the OPeNDAP Data Connector (ODC) along with detailed instructions for creating each one.. All of the actual png files you see in the.. browser.. were generated directly by the ODC.. No image editing program was used to create or modify the images.. Starter Tutorial.. -  ...   a generic plotter requiring no.. special.. configuration, variable conventions or other setup.. The supported plot types are pseudocolor, XY (line/scatter), vector and histogram.. Pseudocolor.. Pseudocolor or false color plots associate values or ranges of values in the data with a particular color.. The ODC has a powerful color control capability that makes it easy to generate and modify color spectrums.. Carolinas Bathymetry.. Sea Surface Temperature.. Winter Weather.. OPeNDAP Data Connector Plot Gallery Revised 17 June 2004..

    Original link path: /ODC_Webguide_plotgallery
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  • Title: ODC Web Guide : Plot Panel | OPeNDAP
    Descriptive info: › ODC Web Guide : Plot Panel.. ODC Web Guide : Plot Panel.. Mon, 05/02/2011 - 20:18 —.. The view / plot panel allows the user to plot the data.. Using the Plot Panel.. The plot panel looks like this:.. When data is sent from the retrieve panel to the plotter using the "Output to".. button.. , the title of the dataset will appear in the list at the top of the plot panel (this list can be hidden with the "Show Datasets" checkbox).. After selecting a dataset the user needs to indicate what kind of plot they want to do, pseudocolor, vector, xy or histogram.. Pick an item  ...   user to indicate which variable to plot and how to configure the axes as well as other options.. Here the user has indicated that the variable "dsp_band_1" should be the variable plotted and the axes should be scaled by the vectors "lat" and "lon".. If the data is in the format of a grid the ODC can automatically configure the axes in many cases.. Select an output destination in the drop-down list next to the blue "Plot" button and click the button.. The plot will be generated.. check out the ODC Plot Gallery.. return to Webguide Home.. OPeNDAP Data Connector Web Guide - Search Revised 28 May 2004 ·..

    Original link path: /ODC_Webguide_plotpanel
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  • Title: Pseudocolor : Weather | OPeNDAP
    Descriptive info: › Pseudocolor : Weather.. Pseudocolor : Weather.. Tue, 05/03/2011 - 10:40 —.. Winter Weather from the National Climatic Data Center (NCDC).. With the OPeNDAP you have instant.. access.. to the world's primary weather data sources.. This plot illustrates how to do animations.. Go to the dataset list.. Expand NOAA - National Climatic Data Center (NCDC).. Select AWIPS Eta Model Data to the retrieve panel.. Drill down the directories to /200401/20040108.. Select (single-click) the file early-eta_212_20040108_0000_fff.. These weather datasets can be complicated.. We need an introduction to the data.. Here's an easy way to get it: notice that when you selected the file the full URL to that resource appeared in the location bar.. It should read:.. http://nomads.. ncdc.. noaa.. gov:9090/dods/NCDC_NOAAPort_ETA/200401/20040108/early-eta_211_20040108_0000_fff.. This URL points to an OPeNDAP server (aka DODS), but it's a good guess that the machine and domain have introductory materials.. Copy and paste the first part of the URL (.. gov.. ) into a browser.. Bingo! The.. host.. has a full set of web documents describing the web resource which you can research to find out what the data means.. Now, armed with this information, we can.. continue.. Double-click the file to see it's structure.. Check "Show Descriptions".. [this will give use more information on the fields in the data].. Choose the grid named "cpofpsfc" (select the grid and array variable cpofpsfc).. [according to the description this is surface probability of frozen precipitation, ie  ...   by making dedicated colors for these special values.. Add Colors for Key Values:.. Go to the Colors tab.. Click "Plot Uses".. [the color editor will become active].. Select the Missing range.. Edit the missing values text box in the range editor (middle of screen) by deleting 0 and 100.. Press enter to save your changes.. [notice how the range list updates to reflect your change].. Add a new range (add range button is in lower left corner).. Select the new range.. [notice that an interface to modify the range appears in the range editor].. Change "Single Value" to "Yes".. Change the data value to 100.. Change the color to a slightly dark green (I used 47 FF D0 ).. Repeat for the 0 value but used a washed out, low-saturation, yellow (29 50 FF).. [coloring the 0 value will show us the satellite swath].. Modifying the Text:.. Go to the Plot Options tab.. Turn off "Generate Axis Captions".. Add the new title, date and axes captions.. Animate the Plot:.. Go to the Variables tab.. Change the Time constraint from "1" to "1-17".. [you are watching the snow pattern over a 17-hour period on January 8, 2004].. [tip: if your image size is too large you could run out of memory doing this].. Tip: Finding More Data.. The dataset list only lists some of the data available at NCDC.. Explore there to find more OPeNDAP data sets..

    Original link path: /Pseudocolor_Weather
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  • Title: Pseudocolor : Sea Surface Temperature | OPeNDAP
    Descriptive info: › Pseudocolor : Sea Surface Temperature.. Pseudocolor : Sea Surface Temperature.. Tue, 05/03/2011 - 10:34 —.. Sea Surface Temperature from MODIS AQUA.. The highest-quality sea surface temperature data is derived from the Moderate-resolution Imaging Spectroradiometer (MODIS) instruments aboard the NASA Terra and Aqua.. satellites.. Data are currently available globally at 4 km, 36 km and 1.. degree.. resolutions with daily, weekly and monthly time intervals and all are available via OPeNDAP.. This plot shows how easy it is to instantly generate a pseudocolor with no configuration using the ODC.. >.. Expand NASA/JPL Physical Oceanography.. (PODAAC).. Expand Sea Surface Temperature.. Select 36 km Gridded Daily (Aqua) to the retrieve panel.. This is one of the datasets derived from the AQUA satellite.. With a lot of the remotely sensed data there may little or no semantic information in the data description itself and the file names do not help much either.. To get handle on the data, after you have done the basic directory retrieval try this technique: copy the initial part of the URL from the location bar at the top of the retrieval screen (in this case the URL starts with.. http://dods.. jpl.. nasa.. and visit the web site.. You will often find detailed information on the normal.. website.. and that is true of the PODAAC datasets such as MODIS AQUA.. Drill down to 2004/001 and select the first file (MY36MDN1.. sst.. ).. Retrieve the structure for MY36MDN1.. sst by double-clicking on the file name.. Select the main array by selecting Structure, Structure, SST Mean.. [all three radio buttons should be on].. Click the red Output to (plotter) button [red indicates a network access will occur].. [you will now automatically be moved to the View / Plot panel].. [the data, about 2M, will download; when it completes the variable selector tab will populate].. Click the blue Plot to (preview) button [the default settings should be fine for  ...   tab of the plot panel.. [to left (y-axis) and to the bottom (x-axis) of the axes you will see the axis mapping selectors].. In each of the selector drop-down boxes select "[indexed]".. Setting the Colorbar Bias:.. [The actual temperature values from the satellite are on a different scale than the standard of measurement (degrees celsius).. We need to find out what this bias is and adjust for it.. Usually you can see the linear bias values (slope and intercept) in the structure description on the retrieval pane if you click the "show descriptions" check box, but here a syntax error is preventing the DAS (description) information from being read.. You can see the warning that this happened if you go to View / Text and click the "Show Errors" button.. This warning also briefly appears in the status bar when it occurs.. So we need to manually get the DAS.. ].. Accessing a DAS Manually:.. Copy the file URL from the location bar up to but not including the question mark and append ".. DAS" and paste it in a browser.. The DAS text will be shown.. At the bottom of this long file you will see the slope is 0.. 01 and the intercept is -300.. Now we can proceed.. Go to the plot options tab.. In the legend section there is a sub-panel entitled "Linear Bias".. Turn off the check "No adjustment".. Enter the slope and intercept determined as in the paragraph above.. The dataset list only contains a collection of sites and resources we have identified, but there are a lot of other directories not listed.. When you are interested in big resource site like PODAAC go to their web site to find out what data they have and then look for the OPeNDAP URLs.. You will often be able to find URLs that are not in our dataset list.. return to OPeNDAP home..

    Original link path: /Pseudocolor_SeaSurface_temp
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  • Title: Instructions : Working with Text | OPeNDAP
    Descriptive info: › Instructions : Working with Text.. Instructions : Working with Text.. Tue, 05/03/2011 - 10:26 —.. The ODC plotter has a flexible text editing and placement system that allows you to quickly and accurately.. locate.. text with little or no guesswork.. Key Points.. * To edit existing text, select desired text item in the "Text Annotations" box.. * To add new text click the "Add".. and edit the newly created item.. * To  ...   * Once you have selected a text item you can modify where it appears on the plot using layout.. * You can also change it's font, size, bold/italic and color.. How Layout Works.. * Item layout is always relative to an object.. * The orientation is where the text appears on that relative object.. * The alignment is how the text rectangle itself is positioned.. * Rotation is clockwise starting at the horizon..

    Original link path: /ODC_gallery_instructiontext
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  • Title: OPeNDAP Data Connector Tutorial | OPeNDAP
    Descriptive info: › OPeNDAP Data Connector Tutorial.. OPeNDAP Data Connector Tutorial.. Tue, 05/03/2011 - 09:40 —.. OPeNDAP.. Data.. Connector.. Tutorial.. This tutorial walks you through the basic operations in the OPeNDAP Data Connector.. It is highly recommended that new users do the tutorial to get oriented to the software.. In the tutorial you will go through the steps to create the following plot:.. Step.. -By-Step.. Operating the ODC involves three steps:.. (1) identify the dataset you want to use (Search).. (2) retrieve its structure and make a sub-selection of the data if desired (Retrieve).. (3) output or view the data (View).. The controls for these three steps are grouped onto three tabs accessible at the top of the screen.. Follow along to learn how to do these steps.. In some cases there will be a hyperlink if there are more detailed.. directions.. for a particular step on a different page.. 1 - go to Search / Dataset List tab.. 2 - click once on the "+" to go into the "University of Rhode Island.. " folder.. 3 - go into the "1.. 1km Northwest Atlantic AVHRR" folder.. 4 - single click (DO NOT DOUBLE CLICK) on "Pathfinder SST"; your choice will highlight.. [notice how the URL for the dataset is shown at right].. 5 - single click the red "To Retrieve" button at the top of the screen.. [you should now move automatically to  ...   the "dsp_band_1" variable.. 9 - modify the array ranges so they read "0:10:6143" (enter key "saves" the change).. [this specifies you only want every 10th value in the array].. [we subset the data like this because a 6143 x 6143 matrix.. would take a lot longer to process without adding much more to see].. 10 - select "Plotter" in the drop-down list next to the "Output to" button.. 11 - click the "Output to" button.. [you will automatically move to the View/Plot pane].. [the data will automatically be loaded to the plot pane].. [this dataset is about 1.. 5 megabytes].. 12 - single click.. plot type.. "Pseudocolor" if it is not already selected.. [the x and y values will automatically be picked for you].. 14 -.. single click the blue "Plot" button.. [a plot of the data will appear in a separate window].. Congratulations you have done a plot!.. Extra Credit - If you want to add in the coastline go to the options tab and.. change.. 'Show Coastline' to yes [you have to reverse the y-axis to get the coast oriented correctly].. If you would like to see learn more about operating the ODC read the help file.. Click the "Help" tab to read the help file.. You can learn more about plotting by perusing the.. plot gallery.. Go to OPeNDAP home.. OPeNDAP Data Connector Tutorial Revised 24 January 2004 ·..

    Original link path: /ODC_gallery_tutorial
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  • Archived pages: 580