The forward-looking statements contained in this press release are expressly qualified in their entirety by the foregoing cautionary statements. All such forward-looking statements are based upon data available as of the date of this release or other specified date and speak only as of such date. MDA and DigitalGlobe disclaim any intention or obligation to update or revise any forward-looking statements in this press release as a result of new information or future events, except as may be required under applicable securities legislation.

ADDITIONAL INFORMATION ABOUT THE MERGER AND WHERE TO FIND IT

This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval. This communication may be deemed to be solicitation material in respect of the proposed merger of DigitalGlobe, Inc. ("DigitalGlobe") with a wholly owned subsidiary of MacDonald, Dettwiler and Associates Ltd. ("MDA"). In connection with the proposed merger, MDA has filed a registration statement on Form F-4 (333-217512) with the SEC, which has been declared effective by the SEC and includes a proxy statement of DigitalGlobe that also constitutes a prospectus of MDA. Each of MDA and DigitalGlobe may file other relevant documents with the SEC regarding the merger. MDA and DigitalGlobe have mailed the definitive proxy statement/prospectus to DigitalGlobe's stockholders. The definitive proxy statement/prospectus contains important information about the proposed merger and related matters. STOCKHOLDERS OF DIGITALGLOBE ARE URGED TO READ ALL RELEVANT DOCUMENTS FILED WITH THE SEC, INCLUDING THE DEFINITIVE PROXY STATEMENT/PROSPECTUS (INCLUDING ALL AMENDMENTS AND SUPPLEMENTS), CAREFULLY AND IN THEIR ENTIRETY BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT DIGITALGLOBE AND THE MERGER. Stockholders are able to obtain copies of the proxy statement/prospectus and other relevant materials and any other documents filed with the SEC by DigitalGlobe for no charge at the SEC's website at www.sec.gov. Copies of the documents filed with the SEC by MDA also can be obtained free of charge on MDA's corporate website at www.mdacorporation.com or by contacting MDA's Investor Relations Department by telephone at (604) 331-2044 or by mail to MDA, Attention: Investor Relations Department, 1570 – 200 Burrard Street, Vancouver, BC V6C 3L6. Copies of the documents filed with the SEC by DigitalGlobe also can be obtained free of charge on DigitalGlobe's corporate website at www.digitalglobe.com or by contacting DigitalGlobe's Investor Relations Department by telephone at (303) 684-4000 or by mail to DigitalGlobe, Attention: Investor Relations Department, 1300 W. 120th Ave., Westminster, CO 80234. In addition, in connection with the proposed merger, a management information circular of MDA, describing details of the transaction and other information, has been mailed to MDA's shareholders. The management information circular contains important information about the proposed merger and related matters. SHAREHOLDERS OF MDA ARE URGED TO READ ALL RELEVANT DOCUMENTS FILED WITH CANADIAN SECURITIES REGULATORY AUTHORITIES, INCLUDING THE MANAGEMENT INFORMATION CIRCULAR, CAREFULLY AND IN THEIR ENTIRETY BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT MDA AND THE MERGER. Additional information about MDA, including all relevant documents filed with Canadian securities regulatory authorities, can be found under its corporate profile on SEDAR at www.sedar.com or by contacting the contact above.

PARTICIPANTS IN THE SOLICITATION

This communication is not a solicitation of proxies in connection with the proposed merger. However, DigitalGlobe, MDA and their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from DigitalGlobe's stockholders in respect of the proposed merger. Information about the directors and executive officers of DigitalGlobe, including their respective interests by security holdings or otherwise, is set forth in the definitive proxy statement/prospectus mailed to DigitalGlobe stockholders in connection with the proposed merger. Additional information about DigitalGlobe's directors and executive officers is also available in DigitalGlobe's proxy statement for its 2017 annual meeting of stockholders filed with the SEC on May 1, 2017. Information about the directors and executive officers of MDA, including their respective interests by security holdings or otherwise, is set forth in the definitive proxy statement/prospectus for the proposed merger and in the management information circular mailed by MDA to its shareholders. Additional information about MDA's directors and executive officers is also available in the management proxy circular for MDA's 2017 annual and special meeting of shareholders, which was filed on MDA's SEDAR profile on June 22, 2017 and which is available at sedar.com. These documents can be obtained free of charge from the sources indicated above.

ABOUT DIGITALGLOBE

DigitalGlobe is a leading global provider of high-resolution Earth-imagery products and services sourced from our own advanced satellite constellation and third-party providers. Our imagery solutions support a wide variety of users in defense and intelligence, civil agencies, mapping and analysis, environmental monitoring, oil and gas exploration, infrastructure management, Internet portals, and navigation technology. Each day users depend on us to better understand our changing planet in order to save lives, resources and time.

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DigitalGlobe, Inc.
Turner Brinton, 303-684-4545
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Eric Brielmann, 212-355-4449
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Investor Relations Contact
DigitalGlobe, Inc.
Fred Graffam, 303-684-1692
Senior Vice President, Investor Relations and Corporate Development
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